At upper temperatures, the thermal conductivity decreases slowly with increasing temperature than depicted by this equation. Aluminum has the higher temperature change.
What is Aluminum ?Aluminum is a silvery-white metal and is the 13th element on the periodic table. A surprising fact about aluminum is that it is the most common metal on earth.Aluminum (Al), also known as aluminum, chemical element, light silvery-white metal of the 13th main group (III a, or boron group) of the periodic table. Aluminum is the most abundant metallic element in the earth's crust and the most commonly used non-ferrous metal. Aluminum is a silver-white colored lightest metal. Soft and easy to play. Aluminum is used in a variety of products including cans, foils, kitchenware, window frames, beer kegs and aircraft components.to learn more about Aluminum from the given link:
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how can you calculate thë mechanical advantage a simple machine provides?
a. divide the output force by the output displacement
b. divide the output force by the input force
c. divide the output displacement by the input displacement
d. simple machines do not provide a mechanical advantage
The mechanical advantage a simple machine is obtained by dividing the output force by the input force.
option B.
What is mechanical advantage?
The mechanical advantage of a simple machine is the ratio of output force to input force. It is also the ratio of load overcame by a simple machine to the effort applied by the simple machine.
Mathematically, the formula for mechanical advantage of a simple machine is given as;
M.A = output force / input force
M.A = Load / effort
Thus, the mechanical advantage of a simple machine depends on the output force of the machine and the input force of the machine.
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Which figure below shows the correct vector
relationship between voltage and current in a
parallel LC circuit?
IL
1 poin
Ic
The capacitive current would be lead by the inductive current. Option A
What is the current and the voltage?We know that the current is the flow of electrons in the circuit. The cutrrent and the voltage in the cell can be related by the use of the Ohm's law. When we have the RLC circuit, the voltage and the current may lead or lag each other by a phase angle.
A vector diagram can be used to show the way that the voltage does lead or lag the current in the case of the LC circuit as we can see from the complete question shown in the image attached.
Hence, we can see that the indictive current leads the capacitive current.
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The researchers calculated a chi-square value of 29.25. If there are three degrees of freedom and the significance level is p=0.05, which of the following statements best completes the chi-square test?
The chi-square test indicates that the observed data is statistically significant, as the chi-square value of 29.25 is greater than the critical value of 7.815 at the 0.05 significance level and three degrees of freedom.
What is chi-square test?The chi-square test is a statistical test used to determine if there is a significant difference between observed frequencies and expected frequencies in one or more categories. It is commonly used in hypothesis testing to compare the observed data to expected data, and to measure how well a particular model fits the data. The chi-square statistic is calculated by subtracting the expected frequencies from the observed frequencies, squaring each of the differences, and then summing them. The result is then compared to a chi-square table to determine the probability that the observed data did not differ from the expected data.
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a construction crew is lengthening a road that originally measured miles. the crew is adding one mile to the road each day. the length, (in miles), after days of construction is given by the following function.
As the crew is adding one mile to the road each day, so the length of the road after 27 days is 79 miles.
A collection of skilled workers, including a supervisor, a construction manager, a distinct maintenance staff, and a team of specialist labourers, make up an efficient construction crew. Employees must actively participate in the prevention of hazardous situations as they have a significant role to play.
A road construction crew assists with new road and sidewalk creation, repairs to or improvements to current roads, and the burying of wires underneath the local roads. They are also known as vehicle restraining operators and highway maintenance operators.
The question is incomplete, find the complete question here
A construction crew is lengthening a road that originally measured 52 miles. The crew is adding one mile to the road each day. The length, L (in miles), after d days of construction is given by the following function. L = 52 + d. what is the length of the road after 27 days?
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imagine that you are floating on the international space station, tossing a bag of dried ice cream to a fellow astronaut. Which of the choices describes an action–reaction force pair for a space station containing astronauts in orbit about the earth?
(A) The weight of the astronauts and the centripetal force on the space station.
(B) The weight of the space station and the centripetal force on the space station.
(C) The weight of the astronauts and the gravitational force of the space station on the astronauts.
(D) The weight of the space station and the gravitational force of the space station on the earth.
The weight of the astronauts and the gravitational force of the space station on the astronauts describes the action-reaction force pair in the space.
According to Newton's law of gravitation, every objects attracts every other object in the universe with a force called gravitational force. This force is directly proportional to the product of the objects' masses and inversely proportional to the square of the distance(d) between them.
F = gMm/d²
Now according to the third law of newton every force has an equal and opposite reaction. So the gravitational force of the space station will be equal to the weight of the astronauts on the space station.
Hence the correct option is C.
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four solid plastic cylinders all have radius 2.55 cm and length 6.24 cm. find the charge of each cylinder given the following additional information about each one
The charge with uniform density 15.9 nC/m^2 everywhere on its surface is 4.8nC, on its curved lateral surface only is 582.5nC, throughout the plastic is 1730.6nC, along the length of the plastic is 174.7nC.
Given the radius of cylinder (r) = 2.55cm = 2.55 x 10^-2m
The length of cylinder (h) = 6.24cm = 6.24 x 10^-2m
The total surface area of cylinder is calculated as: (A) = 2πr(r + h)
Then, A = 2 x 3.14 x 2.55 x 10^-2(2.55 x 10^-2 + 6.24 x 10^-2)
A = 188.8 x 10^-4m^2
The charge on cylinder = q
We know that the charge density is calculated as:
charge = charge density x total area of cylinder
(a) Given the charge density on cylinder a is = 15.9NC/m^2
The charge on cylinder = surface area x charge density
charge = 4πr^2 x 15.9 = 4 x 3.14 x (2.55 x 10^-2)^2 x 15.9 = 4.8nC
(b) the charge density on curved lateral surface only = 15.9nC/m^2
charge = 2πrhx15.9 = 2 x 3.14 x 2.55 x 10^-2 x 6.24 x 10^-2 x 15.9
= 582.5 nC
(c) the charge density throughout the plastic is = 475 nC/m^3
charge = πr^2h x 475 = 1730.6 nC
(d) along the length of the plastic is 64.2 nC/m
charge = πrh x 64.2 = 174.7 nC
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complete question: four solid plastic cylinders all have radius 2.55 cm and length 6.24 cm. find the charge of each cylinder given the following additional information about each one.
Cylinder (a) carries charge with uniform density 15.9 nC/m^2 everywhere on its surface.
Cylinder (b) carries charge with uniform density 15.9 nC/m^2 on its curved lateral surface only.
Cylinder (c) carries charge with uniform density 475 nC/m^3 throughout the plastic.
Cylinder (d) carries charge with uniform linear density 64.2 nC/m along the length of the plastic.
for the pulley system shown, determine the acceleration and velocity of block a after block b has fallen for 3 seconds from rest. block b accelerates at 0.5 m/s2. (0.25 m/s2, 0.75 m/s)
At the time when the Acceleration of b is 0.5 the acceleration would be 0.25 m/s2 and the velocity would be 0.75 m/s after 3 seconds of falling B.
The relation between the acceleration of 2 bodies in this situation will be as a1 = 2a2 where a1 is the acceleration of body1 and a2 is the acceleration of body2. So given the acceleration of the body at 3 seconds is 0.5 m/s2 so the acceleration of body1 would be half of the body1.
Similarly for velocity using v= u+ at ....(i). we can find the velocity of body1 as we have acceleration(a), time(t), And Initial Velocity(u).
u= 0 ................ (As the body starts from rest)
a = 0.25m/s2 .........(calculated on the basis of the acceleration of body2)
t = 3 Seconds ---(As given)
So from (i) we can say
v = 0+ 0.25*3 => v = 0.75 m/s
So the velocity of body 1 will be 0.75m/s after 3 seconds of falling down.
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Your physics teacher crumples a piece of paper into a ball and releases it from rest 2.0 m from the ground. How long does the ball take to hit the ground?
When the ball is released from rest 2.0 m from the ground, it will hit the ground at 0.63 seconds.
What is the fall kinematics equation?Therefore, acceleration owing to gravity is the name given to the acceleration of falling objects in free fall.
The paper ball falls from the rest, so the initial velocity will be 0.
s = ut + 1/2 at²
S is the height
u is the initial velocity
g is the gravity (9.81 m/s²)
t the time
The height will be 2.0 m, u = 0
2 = 0 x t + 1/2 x 10 x t²
2 = 5t²
t² = 2/5
t = 0.63 seconds.
Therefore, the ball will hit the ground after 0.63 seconds of its release.
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A 100-g toy car is propelled by a compressed spring that starts it moving. The car follows the curved track in Figure 7.39. Show that the final speed of the toy car is 0.687 m/s if its initial speed is 2.00 m/s and it coasts up the frictionless slope, gaining 0.180 m in altitude.
In order to solve this, we can use the conservation of mechanical energy. The total mechanical energy of an object is the sum of its kinetic energy (KE) and its potential energy (PE).
The initial mechanical energy of the toy car is the sum of its initial kinetic energy and its initial potential energy, which is zero since it starts at the same level as the track. The final mechanical energy of the toy car is the sum of its final kinetic energy and its final potential energy.
We know the initial speed of the toy car is 2.00 m/s, and it coasts up the frictionless slope, gaining 0.180 m in altitude. We can use these values to find the final mechanical energy of the toy car.
E_initial = KE_initial + PE_initial = (1/2)mv^2_initial + mgh_initial = 0
E_final = KE_final + PE_final = (1/2)mv^2_final + mgh_final
We know the mass of the toy car is 100g and we can convert it to kg by dividing it by 1000.
m = 100/1000 = 0.1 kg
We also know that the acceleration due to gravity is 9.8 m/s^2.
g = 9.8 m/s^2
Substituting these values into the equation for final mechanical energy, we get:
E_final = (1/2)mv^2_final + mgh_final = (1/2) * 0.1 * v^2_final + 0.1 * 9.8 * 0.180 = 0.05v^2_final + 0.018
Since the initial mechanical energy is zero, we can set the final mechanical energy equal to zero and solve for the final velocity of the toy car.
E_initial = E_final = 0
0.05v^2_final + 0.018 = 0
v^2_final = -0.018 / 0.05
v_final = sqrt(-0.018 / 0.05)
The final velocity/speed of the toy car is 0.687 m/s.
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steve had a stroke last year. although he can remember many things from his childhood, he is unable to remember what he just ate for breakfast. it is most likely that the stroke: please choose the correct answer from the following choices, and then select the submit answer button. answer choices brought on alzheimer's disease.
Steve had a stroke last year that most likely the stroke has damaged his frontal lobes.
Stroke can be explained as a condition that occur when sufficient blood does not flow to the brain or due to insufficient flow of blood to the brain. Stroke should be treated as an immediate emergency case as it can lead to difficult walking, talking or paralysis and many more worst cases.
When a person's frontal lobes is damaged the brain may not function properly again and stroke is one of the cause of damaged frontal lobe.
Therefore if he is unable to remember what he just ate for breakfast. it is most likely that the stroke: damaged his frontal lobes.
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from the list below, select the ingredient that is not necessary for the national weather service to issue a blizzard warning.
Bitterly cold air with wind chill temperatures is not required for the national weather service to issue a blizzard warning.
What is weather service?The National Weather Service (NWS) forecasts and issues warnings for weather, hydrologic, and climate conditions for the United States, its territories, adjacent waters, and ocean areas, with the goal of protecting lives and property and boosting the national economy. Weather forecasting services use science and technology to forecast atmospheric conditions. Advances and improvements in forecasting software have allowed digital satellite imagery, radar imagery, model data, and surface observations to more accurately predict weather conditions. Within the Department of War, it was assigned to Brigadier General Albert J. Myer's Signal Service Corps. The National Weather Service was given its first name by General Meyer: The Division of Telegrams and Reports for the Benefit of Commerce.
Here,
The national weather service does not need bitterly cold air with wind chill temperatures to issue a blizzard warning.
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Complete question:
from the list below, select the ingredient that is not necessary for the national weather service to issue a blizzard warning.
a. Bitterly cold air with wind chill temperatures below -18F
b. Falling or blowing snow
c. Reduced visibility to 1/4 mile or less
d. 30 kt (35 mph) sustained winds
the ionosphere (or thermosphere) is really far out there! it is home to which of the following? select all that apply.
The ionosphere is the home of all charged particles in the earth's atmosphere, as well as some of the satellites that we launch.
The ionosphere of Earth extends from the top of the atmosphere to the very edge of space. The Sun heats the gases until they lose an electron or two, resulting in a sea of electrically charged particles.
The ionosphere extends 50 to 400 miles above the Earth's surface, right on the edge of space. The ionosphere, along with the neutral upper atmosphere, forms the boundary between Earth's lower atmosphere — where we live and breathe — and space.
This space boundary is right where many of our Earth-orbiting satellites, including the International Space Station, are located. This means that these satellites can be affected by the ionosphere's constantly changing conditions, such as sudden swells of charged particles that increase drag on satellites and shorten their orbital lifetimes, or how long they can orbit Earth.
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consider an application that transmits data at a steady rate (for example, the sender generates an n-bit unit of data every k time units, where k is small and fixed). also, when such an application starts, it will continue running for a relatively long period of time. answer the following questions, briefly justifying your answer:
Circuit-switched network is the more appropriate for this application that transmits data at a steady rate.
The application would perform best over a circuit-switched network since it requires lengthy sessions with steady, predictable bandwidth needs. Because the transmission rate is steady and known, it is possible to reserve bandwidth for each application session without wasting much of it. In addition, the overhead costs of setting up and tearing down connections are reduced over the lengthy duration of a typical application session.
It makes more sense to use a circuit-switched network rather than a packet-switched network, which is more practical when data shows in bursts, as the data are transmitted at a steady rate (x bits per second, for example), and they are also transmitted over a relatively long period of time rather than in short bursts.
The question is incomplete. The complete question is 'Would a packet-switched network or a circuit-switched network be more appropriate for this application? Why?'
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while the penumbra of a sunspot can "grow" and become bigger. What do you think this means? What is the significance of it for us on Earth
While the penumbra of a sunspot can "grow" and become bigger.The significance is that the area around the sunspot is becoming darker and larger.
Why do sunspots appear and what are they?Sunspots are cooler, darker areas on the sun's surface that stand out from the sun's brighter surroundings. They are brought on by a blockage in the flow of heat and energy from the interior of the sun caused by intense magnetic activity. Sunspots can be anywhere from a few hundred to many thousands of kilometers in diameter and are most common near the sun's poles. Depending on their size and activity, sunspots can last for days, weeks, or even months.
Sunspots are linked to increased solar activity, which can alter Earth's magnetic fields, so this is significant for us on Earth. Geomagnetic storms and additional radiation that reaches Earth's surface as a result of this could disrupt electronic systems like power grids and radio transmissions.
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electric field and electric force .are synonyms referring to the same thing unselected are not the same because electric field refers to the effects of multiple electric forces unselected are unrelated to each other unselected are related quantities, but not the same thing
Electric field and electric force are related quantities, but not the same thing.
The strength of the electric field is defined as the electrostatic force experienced by a small test charge [tex]q_{0}[/tex] placed at that point divided by the charge itself. The electric field is a vector quantity, and its direction is the same as the direction of the force on a positive test charge.
The strength of the Electric field at a point can also be checked by the density of electric field lines present at that point.
The S.I unit of the Electric field is Newton per columb.
The S.I unit of force is Newton.
[tex]F = E \ q_{0}[/tex]
F= electrostatic force
E= electric field
[tex]q_{0}[/tex] = test charge
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which is the best example that something has kinetic energy? question 17 options: a piece of coal before it's burned a tennis ball rolling across the court
Complete Question: Which the best example that something has kinetic energy ___________.
A. Car parked on steep hill.
B. Tennis ball rolls across court.
C. Picture hangs on wall.
D. Piece of coal before being burned
The best example of something with kinetic energy is option B) where a tennis ball is rolling across the court. This is because it is in a state of motion.
An object's energy due to its motion is referred to as kinetic energy. You require effort to move a body with mass from rest to a particular velocity. Body has kinetic energy that it got when it was being accelerated until and unless there is a change in speed.
In the option B, the tennis ball is rolling across the court. This means that it has covered a particular distance in some time, due to which it has attained some speed and possesses acceleration. Due to the change in its motion state, some energy will get stored in it, which entirely depends on its mass and velocity.
In option A, a car is parked which means it is in a state of rest and doesn't possess any speed. As it isn't in motion, it doesn't have kinetic energy.
In option C, a picture is hanging on the wall at a particular height from the ground. It is static and doesn't have any motion due to which there is no kinetic energy. But it will have potential energy.
In option D, a piece of coal before is burned is not in a state of motion but in a change of physical state. Therefore, it isn't a perfect example for kinetic energy.
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A 0.76 kg ball is dropped from a height of 22 m. It strikes the ground with an impact speed of 15.6 m/s. The acceleration of gravity is 9.8 m/s². How much mechanical energy is lost to non- conservative forces? Answer in units of J. Answer in units of J.
Answer:
71 J
Explanation:
You want the energy lost to non-conservative forces when a 0.76 kg ball is dropped from a height of 22 m and impacts the ground at 15.6 m/s.
Potential energyThe potential energy of the ball is ...
PE = mgh
PE = (0.76 kg)(9.8 m/s²)(22 m) = 163.856 J
Kinetic energyThe kinetic energy the ball has when it strikes the ground is ...
KE = 1/2mv²
KE = 1/2(0.76 kg)(15.6 m/s)² = 92.4768 J
Lost EnergyThe energy lost during the fall is ...
PE -KE = lost energy
163.856 -92.4768 = 71.3792 . . . joules
About 71 joules of mechanical energy is lost.
a 3.40-m-long, 410 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. a 72.0 kg construction worker stands at the far end of the beam.What is the magnitude of the torque about the bolt due to the worker and the weight of the beam?
The magnitude of the torque about the bolt due to the worker and the weight of the beam is 13,798.4 Nm.
.What is the magnitude of the torque about the bolt due to the worker and the weight of the beam?
Torque acting on a body about a point is the cross product of the position vector and the force acting on the body. Its magnitude is given by the formula, $\tau = rF\sin \theta $. Complete step by step answer: The magnitude of torque of a body is given as 2.5 Nm.The magnitude of a torque about a fixed axis is calculated by finding the lever arm to the point where the force is applied and using the relation |→τ|=r⊥F | τ → | = r ⊥ F , where r⊥ is the perpendicular distance from the axis to the line upon which the force vector lies.The magnitude of the torque depends on the force, the direction of the force, and where the force is applied. The magnitude of the resultant vector is r F sin(θ). r is measured from the axis of rotation to the line of the force, and θ is the angle between r and F.To learn more about magnitude refers to:
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Identify and draw the forces that act on the pencil. Be certain to draw each force at the correct location (the point at which the force acts on the pencil). The black dot represents the center of gravity of the pencil. Draw the vectors starting at the points where the forces act on the pencil.
A force is a push or pull upon an object resulting from the object's interaction with another object.
What is force?Consequently, this implies that in this situation, the direction of the frictional force should be to the right. Let me now just illustrate this scenario. Therefore, the gravitational force that is always added at the center of mass will act in the same manner, moving towards the center of the earth.The normal force, which is always parallel to the surface of contact, looks like this. That is the gravitational force,There is a solution to this issue since, as I mentioned to the right, we also have the frictional force.A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects.To learn more about force refer to:
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What is the distance from the center of the Earth to a point where the acceleration due to gravity is
g/16?
This same distance from the Earth's core to a location where the gravitational acceleration is g/16 is roughly 20,000 miles (32,000 kilometers).
What is the most basic meaning of acceleration?The pace at which speed changes is known as acceleration. So because direction of an object's velocity is shifting even while it follows a circular course, it continues to accelerate.
How do you determine acceleration?According to the formula a = v/t, kinetic energy (a) is the product of the change in momentum (v) and the shift in time (t).
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I need someone to graph this for me if possible
Here is the formula for the problem
X Axis = 30°/25 DIV = 12 °C/DIV
Y Axis = 6.0cm/19 DIV = 0.3157 => 0.32 cm/DIV
NEED THIS BY 11 PM EST THIS WAS POSTED ON 1/24/2023
To make a graph with the data in the table, we must place the data in a column on the x-axis and the other data on the y-axis to organize the information correctly.
How to make a graph with the information from the chart?To make a graph with the information in the table, we must identify what type of table would serve to relate the data in the table. In this case, a line graph would be useful because it has the purpose of demonstrating the differences of an object over time or subjected to different conditions.
In this case, we want to demonstrate the influence that temperature has on the height of a plant. Therefore, we put the temperature on the y axis and the height of the plant on the x axis.
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to be safe during a lightning storm, it is best to be to be safe during a lightning storm, it is best to be inside a wooden building without any grounding. inside a metal car. on a metal observation tower. next to a tall tree in a forest. in the middle of a grassy meadow.
To be safe during a lightning storm, it is best to be to be safe during a lightning storm, it is best to be inside a metal car.
As the car is made up of metal, it acts as a good conductor and conducts energy from the lightning to the grounded rubber tires.
Being inside a wooden building is not good as wood is a bad conductor.
Staying on metal observation tower is bad as the charges on the tower are attracted to the clouds and lightning strikes you.
It is not safe to stay under tall trees as the charge may jump from trees to you as wood is a bad conductor.
In the middle of grassy meadows is bad as you are taller than surrounding and your are a good conductor.
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If you could drive a Jetson's flying car at a constant speed of 160km/hr (100 mi/hr) across oceans
and space, approximately how long would it take to drive to the nearest star, Alpha Centauri (4.4
light-years away)?
30 million years
30 trillion years
30 millenia years
30 billion years
Driving to the nearest star, Alpha Centauri, would take 26.4 million kilometers.
What is speed?Speed is the rate at which an object moves along a path in time, whereas velocity is the rate and direction of movement. In other words, velocity is a vector, whereas speed is a scalar value. The rate at which an object's position changes in any direction. Speed is defined as the ratio of distance traveled to time spent traveling. The direction of movement of the body or object is defined by velocity. Speed is fundamentally a scalar quantity. Velocity is, in essence, a vector quantity. It is the rate at which distance changes. It is the displacement rate of change.
Here,
speed=distance/time
time=distance/speed
=4.4*9.46 trillion kilometers/160
=26.4 million kilometer
It would take 26.4 million kilometer to drive to the nearest star, Alpha Centauri.
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i give good amount of points
(a) The acceleration of the object when it travels 5 m is 2 m/s².
(b) The time taken for the object to travel the first 12 m is 3.46 seconds.
(c) The work done in displacing the object 12 m is 48 J.
(d) The speed of the object at a displacement of 12 m is 6.92 m/s.
(e) The speed of the object at a displacement of 12 m is zero.
What is the acceleration of the object?
The acceleration of the object is calculated as follows;
a = F / m
when the object travels 5 m, the force = 4 N
a = 4 N / 2 kg
a = 2 m/s²
The time taken for the object to travel the first 12 m is calculated as follows;
t = √ (2s / a )
where;
s is the distancet = √ (2 x 12 / 2 )
t = 3.46 seconds
The work done in displacing the object 12 m is calculated as follows;
W = Fd
W = 4 N x 12 m
W = 48 J
The speed of the object at a displacement of 12 m is calculated as;
v = at
v = 2 m/s² x 3.46 s
v = 6.92 m/s
At a displacement of 20 m, the acceleration of the object is zero, hence the velocity is zero.
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as the box is sliding down the ramp how are the magnitudes of the horizontal and the vertical components of the box's velocity changing
From free body diagram ma = mgsin - mgco.as the box is sliding down the ramp how are the magnitudes of the horizontal and the vertical components of the box's velocity changing.
what is magnitudes of the horizontal and the vertical components of the box's velocity changing?
The horizontal velocity of a projectile is constant (a never changing in value), There is a vertical acceleration caused by gravity; its value is 9.8 m/s/s, down, The vertical velocity of a projectile changes by 9.8 m/s each second, The horizontal motion of a projectile is independent of its vertical motion.This is accomplished by taking the magnitude of the vector times the cosine of the vector's angle to find the horizontal component, and the magnitude of the vector times the sine of the vector's angle to find the vertical component.The magnitudes of the components of velocity v → v → are v x = v cos θ and v y = v sin θ , v x = v cos θ and v y = v sin θ , where v is the magnitude of the velocity and θ is its direction relative to the horizontal.To learn more about components refers to:
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When a certain metal is illuminated by light, photoelectrons are observed provided that the wavelength of the light is less than 669 nm. Which one of the following values is closest to the work function of this metal? (h=6.626 x 10^-34 Js, c = 3.00 x10^8 m/s, 1 eV = 1.60 x10^-19)
A.) 1.9 eV
B.) 2.3 eV
C.) 2.0 eV
D.) 2.2 eV
The work function of this metal is 1.9 eV
The work function (or work function) is defined as the minimum amount of thermodynamic work (i.e. energy) required to remove an electron from a solid to a point in the vacuum immediately outside the solid surface.When light of suitable frequency falls on a metal surface, electrons are emitted. These photo (light) generated electrons are called photoelectrons.Due to the attraction of this positive image, the negative electron turns back to metal surface hence cannot leave the metal crystal permanently. But to overcome this attraction force an electron requires sufficient energy supplied from outside usually from external light sources. The minimum energy required just to escape an electron from a metal surface is known as work function.We know that Work function is defined by : W = hc/λ
Where, h = planck's constant = 6.62 x 10^(-34) J/Hz
c = speed of light = 3 * 10^(8) m/s
λ = wavelength = 669 nm = 669 * 10^(-9)m
Putting these values in equation we get: W = 0.030 * 10^(-17) J
To convert it in eV we divide this by 1ev = 1.60 x10^(-19)
Doing so we get W = 1.9 eV
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Bio-gas is an excellent fuel. Justify the statement by giving 2 sources.
Answer:
Biogas is one of the types of biofuels that is produced by the decomposition of organic substances. Biogas is an excellent fuel.
Explanation:
Reasons are as follows:
1. It is a type of renewable source of energy that has high calorific value also.
2. It is clean source of fuel that leaves no residue like ash in coal, wood burning.
Depending on the type of organic matter used for decomposition during waste treatment technology and hence composition of biofuel varies. The main constituent of biogas is Methane (75%).
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use mechanics equations to solve the problem.
F = Gm1m2/r2 is one way to conceptualize it mathematically.where F denotes the gravitational force between two objects, expressed in Newtons (N). The answer is 7.4125x10²⁸ kg .
Find the gravitational force ?As a result, the gravitational pull between the earth and the moon is 2 10 20 N.Equation for Gravitational Force F = Gm1m2/r2 is one way to conceptualize it mathematically.
where F denotes the gravitational force between two objects, expressed in Newtons (N).
6.674 10-11 Nm2kg-2 is the value of G, the universal gravitational constant.
Given:
r = 3.8x10⁵ km = 3.8x10⁸ m, the distance between the earth and moon,
F = 20.46x10²⁵ N, the gravitational force between the earth and the moon,
G = 6.674x10⁻¹¹ m³/(kg-s²), gravitational constant
M = 5.972x10²⁴ kg, the mass of the earth.
Let m = mass of the moon.
F = (G*M*m)/r^2
m = [20.46×10²⁵ * (3.8×10⁸)²]/[6.674×10⁻¹¹ * 5.972×10²⁴]
= 7.4125×10²⁸ kg
7.4125x10²⁸ kg
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in the town of centralburg (figure 1), which is laid out in a uniform block grid, the grocery store is three blocks east and four blocks north of the post office. which of the following is a correct equation for the quantities represented in this scenario?
a. tan (θ) = dn/de
b. sin (θ) = dn/de
c. θ = dn/de
d. arctan (θ) = dn/de
The correct equation for the quantity represented in the centralburg city scenario laid out in a uniform grid of blocks, the grocery store is three blocks east and four blocks north of the post office is tan (θ) = dn/de (option A)
Take a look at the image below (figure 1)
To determine tan (θ) = opposite side/ adjacent side.
Now, according to the figure,
The angle's opposite side is dn and the adjacent sides is de.
A right-angled triangle serves as the foundation for the three primary trigonometric functions: sine, cosine, and tangent.
The opposite side, adjacent side, and hypotenuse of a triangle are denoted by:
The terms "opposite" and "adjacent" refer to the opposing and adjacent angles.
Put these values into the formula now,
Which results in the equation,
tan (θ) = dn/de
Now, it is clear from the options provided that option A is correct.
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A single cylinder, double acting compressor with bore and stoke of 45 cm x 45 cm is tested at 150 rpm and found to deliver a gas from 101.3 kPa and 300 K to 675 kPa at a rate of 0.166 m^3/s when n = 1.33 for compression and expansion process? Calculate the percent clearance.Answer in %
A single cylinder, double acting compressor with bore and stroke of 45 cm x 45 cm is tested at 150 rpm. The percent clearance is 586.6%
What is a formula?An equation is a mathematical statement that uses the equals sign (=) to show that two expressions are equal. Equations can be used to find solutions to problems with unknown values and to define relationships between various variables. Equations are also used to represent natural laws and describe the behavior of physical systems.
The following equation can be used to determine the percentage of clearance:
C is equal to 100 times (Vd/Vs - 1),
where Vd is the volume displaced per cycle and
Vs is the volume swept per cycle.
The following equation can be used to determine the displaced volume per cycle: (n/n-1) x (V1/P1) x (P2 - P1) is Vd.
The following equation can be used to determine the swept volume per cycle: Vs is equal to /4 × (D2) × L, where D is the cylinder's bore and L is its stroke.
We obtain: by putting the given values into the equations:
Vs = /4 × (452) × 45 = 10302.5 cm3/cycle = 0.01031 m3/cycle
C = 100 × (6.049/0.01031 - 1) = 586.6%,
which indicates that the clearance percentage is 586.6%.
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