Answer:
Look below.
Explanation:
1.) The resistance of a light bulb filament is effected by both length and cross-sectional area. Thicker wires have less resistance. A 120-Watt bulb has a greater current and a smaller resistance. Thus, a 120-Watt bulb must have a thicker filament than a 60-Watt bulb (assuming the lengths of the filaments are identical). We also think of lightbulbs in terms of their power ratings in watts. Let us compare a 25-W bulb with a 60-W bulb. Since both operate on the same voltage, the 60-W bulb must draw more current to have a greater power rating. Thus the 60-W bulb’s resistance must be lower than that of a 25-W bulb. If we increase voltage, we also increase power. For example, when a 25-W bulb that is designed to operate on 120 V is connected to 240 V, it briefly glows very brightly and then burns out. Precisely how are voltage, current, and resistance related to electric power?
2.) Energy transferred = 120 × 2 = 240 J. This equation can be rearranged to V = E ÷ Q. So voltage is energy transferred divided by charge.
3.) Power= Voltage × Current
4.) W=Pt
Look at the diagram. Both cars start from the same point. Which describes the motion shown?
A:One car travels south at 4 m/s. The other car travels east at 2 m/s.
B:One car travels north at 4 m/s. The other car travels west at 2 m/s.
C;One car travels north at 2 m/s. The other car travels east at 4 m/s.
D: One car travels south at 4 m/s. The other car travels west at 2 m/s. 7 of 10
Answer:
I can't see anything so I can't to answer this question
Answer:
I think it MIGHT be A Can't see much ....
Explanation:
elastic materials maintain their nature in all circumstance. true or flase
Answer:
False
Explanation:
If an elastic material is stretched with enough force it will go beyond its 'Elastic Limit' otherwise known as its 'Limit of Proportionality'.
When this happens permentant deformation wiil occur.
Think of a spring... if it is stretched with enough force it won't return back to its original shape. Therefore it has NOT maintained its nature.
He did it well ( into negative)
Answer:
He did not do it very well.
Explanation:
He did it well ( into negative)
= He didn't do it well....
How does nuclear fusion differ from nuclear fission
Answer:
They are the polar opposite of each other.
How?Nuclear fusion is when two or more atomic nuclei combine together to form a different atomic nuclei. Nuclear fission is when the atom splits into two smaller nuclei.
What are dogs trained to do when they find an explosive device?.
Answer:
They sit or lay quietly
Explanation:
That's what they are trained to do when they find a explosive device
Questions #7 and 8:
Part 1 of 2: An ideal gas, initially at a volume of 6.22222 L and pressure of 9 kPa, undergoes isothermal expansion until its volume is 8 L and its pressure is 7 kPa. Calculate the work done by the gas during this process. Answer in units of J.
Part 2 of 2: Find the heat added to the gas during this process. Answer in units of J.
(a) The work done by the ideal gas during the isothermal exapnsion process is -3.556 J.
(b) The heat added to the gas during this process is 3.556 J.
Work done by the ideal gas
The work done by an ideal gas in isothermal expansion is change in pressure and volume of the gas. The change in the internal energy of the gas is zero.
The work done by the given ideal gas is calculated as follows;
W = ΔPV
where;
ΔP is change in pressure of the gasΔV is change in volume of the gasW = (P₂ - P₁)(V₂ - V₁)
W = (7kPa - 9kPa)(8L - 6.222L)
W = -3.556 kPa.L
1 kPa.L = 1 J
W = -3.556 J
Heat added to the processΔU = q + w
where;
ΔU is change in internal energy = 00 = q + (-3.556)
q = 3.556 J
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A strong permanent magnet is difficult to move along the aluminum plate, but the magnet does not stick to the plate. Why is it like that ?
Because of its crystal scructure, usually under normal circumstances aluminum is not magnetic. This is why the magnet does not stick to the plate. The aluminium material is referred to as a paragmetic material, it shares this classification with other metals such as Lithium and Magnesium.
A machine puts out 100 watts of power for every 1000 watts put into it. The efficiency of the machine is 50%. 90%. 10%. 110%. none of the above
Answer:
Explanation: 10%
The symbol equation for combustion of a hydrocarbon is shown below. What number will go before the oxygen reactant when this equation is balanced?
Answer:
5 Oxygen , 3 Carbon dioxide and 3 water
Answer: the answer is 5
A cart with mass 2m has a velocity v before it strikes another cart of mass 3m at rest. The two carts couple and move off together with a velocity of?
Answer:
2/5 v
Explanation:
Use conservation of momentum
originally mv = 2m v
after the crash mv is still the same (2mv)
but the mass is now 5m x where x is the new velocity
2mv = 5 mx
x = 2/5 v
The momentum of two objects in a collision is conserved. Hence, the total initial momentum is equal to the final momentum of the coupled mass. Here the final velocity will then be 2/5 v.
What is momentum ?Momentum of a moving object is the product of mass and velocity. It is a vector quantity with direction and magnitude. The total momentum of two colliding bodies is equal to the total final momentum after collision.
Let m1 and m2 be the masses and v1 and v2 be the final velocities. Vt be the velocity of the coupled mass.
Then, m1 v1 + m2 v2 = (m1 + m2) Vt
Given, mass of cart 1 = 2m
cart 2 = 3m
velocity of cart 1 = v
cart = 0 since it was at rest.
Then, 2m v + 0 = (2m + 3m) Vt
Vt = 2/5 v
Therefore, the final velocity of the couple of carts will be 2/5 v.
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How does surface type affect speed?
Answer:
Slick and smooth surfaces mediate friction to a low, allowing an object to speed across it with low resistance.
Explanation:
Suppose that a sound wave has a wavelength of 12 meters and a frequency of 100Hz. What is the speed of sound
Answer:
1200Hz
Explanation:
You would have to multiply 12 by 100 to get the answer.
12 • 100 = 1200 Hz
I hope it helps! Have a great day!
Anygays-
How long would it take a machine to do 5000 joules of work if the power rating of the machine is 100 watts?
A. 0.2 s
B. 10 s
C. 50 s
D. 5 000 s
Answer:
hope this he;ps
Explanation:
power = work ÷ time
time = work ÷ power
time = 5,000 J ÷ 100 W
time = 50 s
m=3000km v=25m/s what’s the momentum
Momentum of the given body will be : 75000 Kg m/s
Explanation:According to Newton's first law of motion, all bodies continue to be in the state of rest or motion unless an external force is applied on the body. We can use this in the case of momentum also
The formula of momentum is given by :
[tex]:\implies \sf\quad \sf \: P = mv[/tex]
Here, we are given the mass of the body ( m ) as 3000kg and the velocity of the body ( v ) as 25 m/s. On putting the values in the formula:
[tex] \begin{aligned}&:\implies \sf\quad \sf \: P = mv \\& :\implies \sf\quad \sf \: P = 3000 \times 25 \\ & :\implies \sf\quad \sf \: \boxed{ \sf \: P = 75000kgm {s}^{ - 1} } \end{aligned}[/tex]
Momentum is associated with the mass of the moving body and can be defined as the quantity of motion measured as a product of mass and velocity.
Answer :-
Momentum is [tex] \bf{75,000 \: {kg \: ms}^{ - 1} } [/tex] .Explanation :-
As per the provided information in the given question, we have been given that The Mass is 3000 kg . The Velocity is given as 25 m/s . And, we have been asked to calculate the Momentum .
For calculating the Momentum , we will use the Formula :-
[tex] \bigstar \: \: \: \boxed {\sf { \: Momentum \: = \: Mass \: \times \: Velocity \: }} [/tex]
Therefore , by Substituting the given values in the above Formula :-
[tex] \dag \: \: \: \sf { Momentum \: = \: Mass \: \times \: Velocity} [/tex]
[tex] \Longrightarrow \: \: \: \sf { Momentum \: = \: 3000 \: \times \: 25} [/tex]
[tex] \Longrightarrow \: \: \: \textbf {\textsf {Momentum \: = \: 75000 }} [/tex]
Hence :-
Momentum = [tex] \bf{75,000 \: {kg \: ms}^{ - 1} } [/tex] .[tex] \underline {\rule {180pt} {4pt}} [/tex]
The students changed the release distance of the sphere during their investigation. Which statements best describe the purpose for increasing the release distance between the trials? Select all that apply.
A. to indicate balanced forces are acting on the spheres
B. to determine the types of forces acting on the spheres
C. to measure the strength of the force acting on the spheres
D. to change the direction of the force acting on the spheres
E. to observe the effect of unbalanced forces acting on the spheres
Since unbalanced forces acts on the spheres, the aim of increasing the release distance of the spheres is to observe the effect of unbalanced forces acting on the spheres.
What is an experiment?An experiment is a study whose objective is to study cause and effect relationships. In this case, the students had to increase the distance at which the spheres was released.
The aim of increasing the release distance of the spheres is to observe the effect of unbalanced forces acting on the spheres.
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Determine an expression for the coefficient of static friction in terms of m2 and m1.
1) potential energy+kinetic energy is equal to
A. Gravitational potential energy
B. Thermal energy
C. Chemical energy
D. Mechanical emergy
2) …….. is the study of the composition & properties of matter
A. Ecology
B. Biology
C. Chemistry
D. Model
E. Atoms
3) building blocks of matter are called…
A. Mass
B. RNA
C. Neutrons
D. Atoms
E. Protons
4)the force you apply to a machine is the..
A. Efficiency
B. Input force
C. Output force
D. Resistance
5) friction within machinery increases efficiency
A. True
B. False
Please help<3
Explanation:
1) D.
the other answer options don't make any sense in that regard. these 2 forms of energy represent in total mechanical energy.
2) C. Chemistry
3) D. Atoms.
although, protons and neutrons are part of them.
4) B. Input force
5) B. False
friction causes energy to be diverted to doing unwanted and unnecessary things, like creating heat instead of movement.
There are pros and cons to both e-readers and paper books. Do you think the pros outweigh the cons more for modern electronic readers, or for good old-fashioned paper books? Maybe it simply comes down to personal preferences as opposed to rational decision-making. Which do you prefer? Which do you think is better? Explain.
E-books have made it easier to carry books across long distances and have made learning simpler.
E-books or paper books?In the twenty first century, we have seen a sudden budding of technology such as have never been. Part of this mordern technology is the introduction of electronic books in several formats such as pdf, epub etc.
These books can be read on computers, ipads, laptops, sart phone etc having the appropriate reader software. These ebooks unlike the paper books have eased the inconvienence associated with carrying paper books which are often bulky from place to place.
Several ebooks could be housed at once in a smartphone and carried in the pocket. This has made learning easier than ever. Thus, ebooks are better than paper books.
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define 1 calorie heat
Answer:
"One calorie of heat is defined as the amount of heat needed to raise the temperature of one gram of water by one degree Celsius"
Hope this Helps!
Explanation:
One calorie of heat is defined as the amount of heat needed to raise the temperature of one gram of water by one degree Celsius (or one kelvin).
A 400g mass object at rest is acted on by a 200 N net force for 12 seconds. What is it’s final velocity?
The answer is supposed to be 6000 m/s but I’m not sure how…
Explanation:
do we can say that the first step is finding the acceleration of the object. We do so by saying F = ma
so a = F/m
a = 500 m/s^2
we now have the time, acceleration and initial velocity.
so we can find the final velocity by using one of newtons equations which is: vf = vi + at
so:
vf = 0 + 500 × 12
vf = 6000
note that our initial velocity was zero since the object was initially at rest.
if you still have any doubt dont hesitate to ask for further help.
Challenge question: An arrow is placed at 3 centimeters to the left of a converging lens. The image appears at 3 centimeters to the right of the lens. What is the focal length of this lens? (HINT: Place a dot to the right of the lens where the image of the tip of the arrow will appear. You will only be able to draw lines 1 and 2. Where does line 1 cross the principal axis if the image appears at 3 centimeters?)
The focal length of the converging lens based on the arrow placed 3 centimeters to the left and the imaged formed 3 cm to the right is 1.5 cm.
Focal length of the converging lensThe focal length of the converging lens is determined by applying the following converging lens formula.
1/f = 1/v + 1/u
where;
v is the image distance = 3 cmu is the object distance = 3 cmf is the focal length = ?1/f = 1/3 + 1/3
1/f = 2/3
f = 3/2
f = 1.5 cm
Thus, the focal length of the converging lens is 1.5 cm.
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what is the voltage of a circuit with power 36 W and current 4.5 A
Answer:
8 v
Explanation:
power = watts = v i
36 = v (4.5)
v = 8 v
Heat Capacity is a measure of the heat required to raise the temperature
of 1g of a substance by 1°C.
So...
True or False:
Water has a very high heat capacity, which means it resists changing
temperature when heat is added or removed.
A
True
B
False
Answer: i would say true uwu
Explanation:hope this helps!
....Max-
WILL GIVE BRAINLIEST!!!
What is the equivalent resistance of a circut that contains two 50.0 resistors connects in parellels with a 12.0 V battery?
o A. 25.0
o B. 0.040
o C. 100.0
o D. 0.48
Answer:
1/Re=1/R1 +1/R2= 2x1/R1=2/R1=2/R2=2/50=1/25
1/Re=1/25, so the answer is Re= 25
the answer is A. 25.0
Answer:
A. 25.0
Explanation:
1/Re = 1/R1 + 1/R2 = 2 x 1/R1 = 2/R1 = 2/R2 = 2/50 = 1/251/Re = 1/25
The answer is Re= 25
I hope this helps! Have a great day!
Anygays-
A car travels from City A to City B to the north. It takes 4 hours, and the road mileage is 200 miles. The map shows that
the cities are only 80 miles apart (straight-line distance).
Answer:
The average speed would be the 200 miles/4 hours.
The average velocity would be the net displacement to the north at 80 miles/4 hrs = mph
Explanation:
HELPP
You are given two particles, each with a positive charge,
and a box that is 1 m by 1 m. How would you arrange the
particles to create the weakest electric force between
them? Explain.
Answer:
they are like charges so they magnitude repulsive & direction will be ones left &ones right. but it depends on the axis of rotation.
You are given two particles, each with a positive charge, and a box that is 1 m by 1 m. To arrange the particles to create the weakest electric force between them i put at opposite direction diagonally.
What is force?A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
According to Coulomb's law, the force of attraction or repulsion between two charged bodies is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
To arrange the particles to create the weakest electric force between them i put at opposite direction diagonally.
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A solenoid with an iron core is 25 cm long and is wrapped with 100 turns of wire. When the current through the solenoid is 10 A, the magnetic field inside it is 2.0 T. For this current, what is the permeability of the iron
Answer:
A solenoid is a long coil of wire wrapped in many turns. When a current passes through it, it creates a nearly uniform magnetic field inside. Solenoids can convert electric current to mechanical action, and so are very commonly used as switches. The magnetic field within a solenoid depends upon the current and density of turns.
Explanation:
hope this helped its pretty long
Many people use microwave ovens to cook their food with is best
Answer:
microwave ovens are better for crispy foods microwaves are better for re heating food or microwave food
Explanation:
How does an object's acceleration change if the net force on the object is doubled?
A. The acceleration is cut in half.
B. The acceleration does not change.
C. The acceleration is doubled.
D. The acceleration is multiplied by four
Answer:
its acceleration is doubled.
Explanation:
If the mass is doubled, then acceleration will be halved.
**halved is to divide into two equal parts**
Light with a wavelength of about 490 nm is made to pass through a diffraction grating. the angle formed between the path of the incident light and the diffracted light is 9.2° and forms a first-order bright band. what is the number of lines per mm in the diffraction grating? round your answer to the nearest whole number. lines per mm
The number of lines per mm in the diffraction grating is 326.
What is diffraction grating?A diffraction grating is a type of optical instrument obtained with a continuous pattern. The pattern of the diffracted light by a grating depends on the structure and number of elements present.
The given data in the problem is
[tex]\rm \theta[/tex] is the angle formed between the path of the incident light and the diffracted light = 9. 2°
λ is the wavelength of the light=490nm=4.9
N is the number of lines per mm in the diffraction grating=?
n is ordered = 1
The formula for the diffraction grating is;
[tex]n \lambda = d sin\theta \\\\ d = \frac{n \lambda}{sin \theta } \\\\ d = \frac{1 \times 4.90 \times 10^{-7}}{sin 9.2^0 } \\\\ d=3.06 \times 10^{-6} \\\\ d=3.06 \times 10^{-3} \ mm[/tex]
The number of lines per mm is found as;
[tex]\rm N= \frac{1}{d} \\\\ N= \frac{1}{3.06 \TIMES 10^{-3}} \\\\ N=326.8 /mm[/tex]
Hence the number of lines per mm in the diffraction grating is 326.
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