Answer:
Note: Angle of reflection is the angle the ray makes with the Normal of the Mirror and NOT the Mirror Surface
Since the ray makes an angle of 22° with the Mirror surface
The angle it'll make with the Normal is 90-22(Because both are orthogonal)
So
Angle of Incidence = 90-22 = 68°
From the Law of Reflection
Angle of Incidence = Angle of Reflection
So
Angle of reflection = 68°
Explanation:
what's the main function for the human digested system
Answer:
The function of the digestive system is digestion and absorption. Digestion is the breakdown of food into small molecules, which are then absorbed into the body.
Explanation:I hope it helped
A car has a speed of 20 m/s. If the speed of the car increases to 30 m/s in 5 seconds, what is the car’s acceleration?
2
Explanation:
2 times 5 is 10/ 20+10=30
h2+o2 - h2o mass
Please help
H2O2 H2O
H2 + O2 → H2O. Word equation: Hydrogen gas + Oxygen gas → water. Type of Chemical Reaction: For this reaction we have a Combination reaction. Balancing Strategies: For this reaction it is helpful to start by changing the coefficient in front of H2O and so that you have an even number of oxygen atoms.
When you are describing the rate that a race car goes around a track, should you use the term speed or velocity to describe the motion
Answer:
Speed
Explanation:
Speed is a description of how fast an object moves; velocity is how fast and in what direction it moves. In physics, velocity is the speed in a given direction.
Answer:
speed
Explanation:
Speed is a description of how fast an object moves; velocity is how fast and in what direction it moves. In physics, velocity is speed in a given direction. When we say a car travels at 60 km/h, we are specifying its speed. When we say a car moves at 60 km/h to the north, we are specifying its velocity.
A student uses a 320 Hz tuning fork during a lab investigation into the speed of sound. If the air temperature in the classroom is 20
degrees Celsius, what is the wavelength of the sound waves produced by the tuning fork?
Answer:
Hecht.
Explanation:
If the distance between the magnets tripled what would happen to the force between the 2 magnets?
Answer:
Our Repelling Force Magnet Calculator shows the repelling force on a magnet that happens when another magnet of the same size is placed at some distance from it, with like poles facing one another. The force depends on the distance between the magnets. The farther apart the magnets are, the weaker the force.
Explanation:
I WILL MARK YOU THE BRAINLIEST NO LINKS
What is the net force acting on the airplane?
740 N right -->
700 N right -->
100 N left <--
760 N right -->
Answer:
100 N left <--
Explanation:
Answer:
100 to the left
Explanation:
Concept Development
Practice Page
20-1
Gases
1. A principle difference between a liquid and a gas is that when a liquid is under pressure, its
volume
(increases) (decreases) (doesn't change noticeably)
PHYSICS
and its density
SIGHS
(increases) (decreases) (doesn't change noticeably)
When a gas is under pressure, its volume
(increases) (decreases) (doesn't change noticeably)
and its density
(increases) (decreases) (doesn't change noticeably)
1
2. The sketch shows the launching of a weather balloon
at sea level. Make a sketch of the same weather balloon 1
when it is high in the atmosphere. In words, what is
different about its size and why?
1
1
Answer:
The answer is below
Explanation:
The main difference between a liquid and a gas is that when a liquid is under pressure, its volume "won't change apparently. The reason is that the distance between the molecules of a liquid is relatively small, and the molecules of a liquid extensively withstand the compressive forces. This is similar to the distance between the molecules of a solid."
How do the properties of the planets change as you move away from the sun?
Answer:
as we move away from the sun the velocity of the planet decreases
which items below describes specific kinds of producers.
medical doctor
grocery store owner
a person eating in a restaurant
trial lawyer
computer shopper
Answer:
grocery store owner
medical doctor
trial lawyer
A 300 kg grand piano is pushed up a 4 meter ramp into the back of a truck using 1200 Newtons of force. The bed of the truck is 1.25 meters off the ground. How efficient is the piano mover that pushed the piano into the truck? (2 sig figs and answer in a percentage)
Answer: KE=0.5*m*v2
Explanation: hope this helps!!!
Which of the following is always true about the particles that make up matter? A. They can only be found in solid substances. B. They are too small to be seen with only our eyes. C. They are the same size in all substances, D. They are locked into regular arrangements.
Answer:
I am thinking D. correct me if I am wrong
Object A has a negative charge. Object A is repelled by object B. Object B is repelled by object C and attracted to object D. What are the charges on objects B, C, & D?
Answer:
B negatively charged. C negatively charged. D positively charged.
Explanation:
If A Is negative and B is repelled by it this means that B has to have the same charge as A therefore B is negatively charged.
B is repelled By C therefore meaning they both have the same charge so C has to be negatively charged.
B is attracted to D. attraction occurs between oppositely charged objects. Therefore D has to have the opposite charge of B. Since B is negative D has to be positive in order for that attraction to occur.
What is the average kinetic energy (temperature) of
sample A
What would be the effect of an increase in greenhouse gas concentration in the atmosphere on Earth's average temperatures?
Answer:
See Explanation
Explanation:
Greenhouse gases are those gases that are believed to trap infrared rays close to the earth surface. Infrared radiation is otherwise known as heat rays due its heating effect.
Increase in the concentration of these greenhouse gases will ultimately lead to a gradual increase in the earth's average temperature. This phenomenon is referred to as global warming.
Which statement describes an example of destructive interference?
A. Light shining on a DVD surface produces different colors.
B. Light shining on a surface has gaps after passing through two
slits.
C. A lamp lights an area around a corner.
D. The inside of a seashell appears to be many different colors.
Answer:
B. Light shining on a surface has gaps after passing through two
slits.
Explanation:
Destructive interference is said to occur when two waves cancel out each other. The occurrence of this phenomenon implies that the waves have equal amplitude in opposite directions.
When light shinning on a surface has two gaps after passing through two slits, then the waves have interfered destructively which led to the gaps.
what does the narrator mean when he says that energy is old as time itself
Answer:
The narrator means that all the energy in the universe now was present when the universe started to form long ago
Explanation:
Answer: "The narrator means that all the energy in the universe now was present when the universe started to form long ago."
I have a bottle of gas, the bottle can expand and contract. Initially the gas is at 1 kpa of pressure and a volume of 1 Liter, at a temperature of 290 K. Then the Temperature went to 390 K and the volume of 1.1 Liter. What is the New Pressure? Please help I have been asking this for weeks
Answer:
P₂ = 1.22 kPa
Explanation:
This problem can be solved using the equation of state:
[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]
where,
P₁ = initial pressure = 1 KPa
P₂ = final pressure = ?
V₁ = initial Volume = 1 liter
V₂ = final volume = 1.1 liter
T₁ = initial temperature = 290 k
T₂ = final temperature = 390 k
Therefore,
[tex]\frac{(1\ kPa)(1\ liter)}{290\ k} =\frac{(P_2)(1.1\ liter)}{390\ k}\\\\P_2= \frac{(1\ kPa)(1\ liter)(390\ k)}{(290\ k)(1.1\ liter)}[/tex]
P₂ = 1.22 kPa
A wave transports what
from one place to another.
A friction
OB. atoms
O C. energy
OD, amplitude
1) DeAnna, with a mass of 60.0 kg, climbs 3.5 m up a gymnasium rope. How much energy does
a system containing DeAnna and Earth gain from this climb?
2) An electric motor develops 65 kW of power as it lifts a loaded elevator 17.5 m in 35 s. How
much force does the motor exert?
3) A 25.0-kg shell is shot from a cannon at Earth’s surface. The reference level is Earth’s surface.
a. What is the shell-Earth system’s gravitational potential energy when the shell’s height is
425 m?
b. What is the change in the system's potential energy when the shell falls to a height of 225
m?
4) Shawn and his bike have a combined mass of 45.0 kg. Shawn rides his bike 1.80 km in 10.0
min at a constant velocity. What is the system's kinetic energy?
5) Mary weighs 505 N. She walks down a 5.50-m-high flight of stairs. What is the change in the
potential energy of the Mary-Earth system?
6) Katia and Angela each have a mass of 45 kg and are moving together with a speed of 10.0
m/s.
a. What is their combined kinetic energy.
b. What is the ratio of their combined mass to Katia’s mass?
c. What is the ratio of their combined kinetic energy to Katia’s kinetic energy? Explain how
this ratio relates to the ratio of their masses.
7) A 10.0-kg test rocket is fired vertically. When the engine stops firing, the rocket’s kinetic
energy is 1960 J. After the fuel is burned, to what additional height will the rocket rise?
1. As he climbs... He's gaining potential Energy.
PE=mgh = 60x9.8x3.5=2058J. This is the potential Energy gain.
2. Power = Workdone/Time.
65kW=65,000watts
65000=Workdone/35
Workdone=65,000 x 35=2,275,000J
Recall... Workdone=Force x Distance
given distance =17.5m
Force =Workdone/distance
=2,275,000/17.5
Force=130,000N or 130kN.
3.Potential Energy Increases or decreases as height increases or decreases respectively.
a) PE=mgh =25x9.8x425=104,125J.
b) change in PE=mg(h°-h) =25 x 9.8(225-425)
= -49000J. The Energy is negative because the system loses 49000J.
4. At Constant velocity; d=vt
where d=distance,v=velocity, t=time
v=d/t
1.8km=1800m
10min =10x60=600seconds
v=1800/600
v=3ms-¹
KE=1/2Mv²
=1/2 x 45 x 3² =202.5J.
5.Mary weighs 505N.
Weight=Mass x acceleration due to gravity
W=mg
505=m x 9.8
m=505/9.8 =51.53kg.
Since Mary is coming down... she's decreasing her potential energy cos Potential Energy Decreases as you decrease your height. So Her Initial height was 5.5m... she alighted to the ground which we'll say is the ground(h=0)
Change in PE=mg(h°-h)=51.53 x 9.8(0-5.5) = -2777.5J.
This energy is negative because she lost potential Energy.
6. Since each has a Mass of 45kg... and they're moving together.... Their combined Mass =45+45=90kg.
Velocity given as =10ms-¹
a)Combined KE=1/2MV² = 1/2 x 90 x 10² =4500J.
b)Ratio of combined Mass to Katias mass = CM/KM
Where CM=Combined Mass
KM=Katia's mass
=90/45 =2:1
c) Katia's kinetic E =1/2 x 45 x 10² =2250J.
Ratio of combined to Katia's = CK/KK
CK=Combiner Kinetic Energy
KK=Katia's kinetic energy
= 4500/2250 =2:1.
This answer should be the same cause from the Formula KE=1/2mv²
KInetic Energy varies Directly with Mass
so If the ratio of Masses is 2:1... That of KE should be the same because of their direct Relationship✌.
7.The height at which the Rocket Engine stops is not how far it went. Theres a Minute height that it'll still go before it starts going back down.
from the question... The energy when the engine stops is 1960J
PE=mgh
1960=10x9.8xh
h=1960/98 =20m.
The engine stops at this height
but The additional Minute height that was added before itll start falling cant be calculated from the insufficient info given in this question. If we had the Energy at the additional height-added... We can calculate that height and then subtract 20 from it. That will give the additional added height.
Thats pretty Much Everything✌
Spectro... Out
The energy in the system containing DeAnna and Earth gain from this climb will be 2058J.
How to calculate the energy?From the information, DeAnna, with a mass of 60.0 kg, climbs 3.5 m up a gymnasium rope. The potential energy will be:
= mgh
= 60 × 9.8 × 3.5
= 2058J
When an electric motor develops 65 kW of power as it lifts a loaded elevator 17.5 m in 35s, the force that the motor exerts will be:
= Work done / Time
= 2275000/17.5
= 130000N
The shell-Earth system’s gravitational potential energy when the shell’s height is 425m will be:
= mgh
= 25 × 9.8 × 425
= 104125J
Learn more about energy on:
https://brainly.com/question/13881533
#SPJ2
BTB is an indicator that reacts with CO2. Based on the data that you collected in this experiment, write a conclusion to the question: Does your body breathe out CO2? State your conclusion clearly, and include the evidence from your experiment that supports it.
Answer:
Yes.
Explanation:
Yes, our body breathe out carbondioxide gas because carbondioxide gas is a waste product produced by the cells of the body during the process of respiration. The concentration of carbondioxide gas is higher in the body as compared to the outside environment and oxygen concentration is lower inside the body so diffusion occurs between the lungs and environment so the carbondioxide gas releases in the air and oxygen is trapped by the hemoglobin cells.
What is the importance of centre of curvature in spherical mirror?
Answer:
Rays of light parallel to the principal axis of a concave mirror will appear to converge on a point in front of the mirror somewhere between the mirror's pole and its center of curvature. That makes this a converging mirror and the point where the rays converge is called the focal point or focus .
Explanation:
hopefully that helps you
Answer:
Rays of light parallel to the principal axis of a concave mirror will appear to converge on a point in front of the mirror somewhere between the mirror's pole and its center of curvature. That makes this a converging mirror and the point where the rays converge is called the focal point or focus .
Explanation:
Hope you have a good day :)
what is hypermatropia?
Answer:
Hypermetropia (hyperopia, long-sightedness or far- sightedness) is a form of refractive error in which parallel rays of light coming from infinity are focused behind the light sensitive layer of the retina, when the eye is at rest.5 Dec 2017
Explanation:
thank me later
for every 120 joules of energy input a car waste 85 joules, find the useful energy output of the car?
Answer:
Useful Output = 35 J
Explanation:
The useful energy output of the car must be equal to the difference between the total input energy supplied to the car and the energy wasted by the car:
Useful Output = Total Input - Waste
where,
Total Input = 120 J
Waste = 85 J
Therefore,
Useful Output = 120 J - 85 J
Useful Output = 35 J
Why is the use of an international system of measurement important for science?
Answer:
To avoid confusion when measuring, scientists use a shared system of measurement, called the International System of Units (SI). A common measurement system allows us to make direct comparisons instead of having to know things like how much a certain animal weighs.
Explanation:
The Hubble Space Telescope has a mass of 1.16*10^ 4 kg and orbits the Earth at an altitude of 5.68 * 10 ^ 5 above Earth's surface. Relative to infinitydetermine the potential energy the telescope at this location. Would the formula be Ep=-Gm1m2/r or positive G since it’s relative to infinity
Answer:
[tex]E=8.13\times 10^{12}\ J[/tex]
Explanation:
Given that,
The mass of a Hubble Space Telescope, [tex]m_1=1.16\times 10^4\ kg[/tex]
It orbits the Earth at an altitude of [tex]5.68\times 10^5\ m[/tex]
We need to find the potential energy the telescope at this location. The formula for potential energy is given by :
[tex]E=\dfrac{Gm_1m_e}{r}[/tex]
Where
[tex]m_e[/tex] is the mass of Earth
Put all the values,
[tex]E=\dfrac{6.67\times 10^{-11}\times 1.16\times 10^4\times 5.97\times 10^{24}}{5.68\times 10^5}\\\\E=8.13\times 10^{12}\ J[/tex]
So, the potential energy of the telescope is [tex]8.13\times 10^{12}\ J[/tex].
What is the average velocity of the object from t=1s to t= 3 s?
A. 1 m/s
B. 0.5 m/s
C. -0.5 m/s
D. -1 m/s
Answer:
Explanation:
Since this is a distance v time graph, the slope of the line from 1s to 3s is the velocity. However, it looks like, at t=3, the velocity is 0, so getting the definite velocity is not going to happen. We can estimate it as closely as possible. Since the line is tending from the upper left to the lower right, the slope is negative, so the velocity is also negative. That leaves only C or D as our answers. And the slope is closer to -1 than to -5, so choice D. is the one you want.
A 75.6-kg circus performer is fired from a cannon that is elevated at an angle of 37.2° above the horizontal. The cannon uses strong elastic bands to propel the performer, much in the same way that a slingshot fires a stone. Setting up for this stunt involves stretching the bands by 2.70 m from their unstrained length. At the point where the performer flies free of the bands, his height above the floor is the same as the height of the net into which he is shot. He takes 2.34 s to travel the horizontal distance of 26.9 m between this point and the net. Ignore friction and air resistance and determine the effective spring constant of the firing mechanism.
Answer:
The effective spring constant of the firing mechanism is approximately 21.804 N/m
Explanation:
The mass of the circus performer, m = 75.6 kg
The angle of elevation above the horizontal, θ = 37.2°
The instrument the cannon uses to propel the performer = Strong elastic band
The length by which the band stretches, x = 2.70 m
The height of the performer above the floor at the point the performer flies free of the bands = The height of the net into which he is shot
The time he takes to travel the horizontal distance between the point he is shot and the net, t = 2.34 s
The horizontal distance between the the point he is shot and the net, dₓ = 26.9 m
Therefore, the horizontal component of the velocity, vₓ, can be found with the following kinematic equation of motion;
vₓ = dₓ/t
∴ vₓ = 2.70 m/(2.34 s) = (15/13) m/s
By the resolution of the initial velocity, 'v', into the horizontal and vertical component, we have;
The horizontal component, vₓ = v × cos(θ)
∴ v = vₓ/(cos(θ))
v = (15/13)/(cos(37.2°)) ≈ 1.45
The initial velocity, v ≈ 1.45 m/s
The kinetic energy given to the circus performer by the elastic band, K.E., is given as follows;
K.E. = (1/2)·m·v²
Where;
m = The mass of the performer = 75.6 kg
v = The velocity given to the performer ≈ 1.45 m/s
∴ K.E. ≈ (1/2) × 75.6 × 1.45² ≈ 79.475
∴ K.E. ≈ 79.475 J
The kinetic energy, K.E., given to the performer, (1/2)×m×v² = The kinetic energy of the elastic band = (1/2)×k×x²
Where;
k = The effective spring constant of the firing mechanism
x = The extension of the sling = 2.70 m
Therefore, we get;
K.E. = (1/2)·m·v² = (1/2)·k·x²
∴ K.E. ≈ 79.475 J = (1/2) × 75.6 × 1.45² = (1/2) × k × (2.70 m)²
∴ 79.475 J ≈ (1/2) × k × (2.70 m)²
k = 79.475 J/((1/2) × (2.70 m)²) ≈ 21.804 N/m
The effective spring constant of the firing mechanism, k ≈ 21.804 N/m.
whoever guesses this will have a new frend
Answer:
B
Explanation:
Endothermic reactionIn an endothermic reaction, the products are higher in energy than the reactants. Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings by the reaction.
what force is needed to bring a 1.10 × 10^3 kg car moving at 22 m/s to a halt in 20s?
Answer:
A very very big hole and some ramps