Looking for someone who is very good with physics who needs $$
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fukeneh
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Question 17 2 points Save
Which equation describes the net work done for a complete cycle of a heat engine?
Question 18 2 points Save
How does a real heat engine differ from an ideal cyclic heat engine?
A real heat engine is not cyclic.
An ideal heat engine converts all energy from heat to work.
A real heat engine is not isolated, so matter enters and leaves the engine.
An ideal heat engine is not isolated, so matter enters and leaves the engine.
Question 19 2 points Save
Which of the following is a way to improve the efficiency of a heat engine?
increase Qh
reduce Qh
reduce Wnet
increase Qc
Question 20 2 points Save
An electrical power plant manages to transfer 88 percent of the heat produced in the burning of fossil fuel to convert water to steam. Of the heat carried by the steam, 40 percent is converted to the mechanical energy of the spinning turbine. Which best describes the overall efficiency of the heat-to-work conversion in the plant?
greater than 88 percent
88 percent
40 percent
less than 40 percent
Question 21 2 points Save
What occurs when a system's disorder is increased?
No work is done.
No energy is available to do work.
Less energy is available to do work.
More energy is available to do work.
Question 22 2 points Save
Imagine you could observe the individual atoms that make up a piece of matter and that you observe the motion of the atoms becoming more orderly. What can you assume about the system?
It is gaining thermal energy.
Its entropy is increasing.
Its entropy is decreasing.
Positive work is being done on the system.
Question 23 2 points Save
Which of the following is not an example of approximate simple harmonic motion?
a ball bouncing on the floor
a child swinging on a swing
a piano wire that has been struck
a car's radio antenna waving back and forth
Question 24 2 points Save
Vibration of an object about an equilibrium point is called simple harmonic motion when the restoring force is proportional to
time.
displacement.
a spring constant.
mass.
Question 25 2 points Save
A mass attached to a spring vibrates back and forth. At the equilibrium position, the
acceleration reaches a maximum.
velocity reaches a maximum.
net force reaches a maximum.
velocity reaches zero.
Question 26 2 points Save
If a pendulum is adjusted so that its frequency changes from 10 Hz to 20 Hz, its period will change from n seconds to
n/4 seconds.
n/2 seconds.
2n seconds.
4n seconds.
Question 27 2 points
By what factor should the length of a simple pendulum be changed in order to triple the period of vibration?
3
6
9
27
Like that type of level.
thats one of the tests that i need done
Which equation describes the net work done for a complete cycle of a heat engine?
Question 18 2 points Save
How does a real heat engine differ from an ideal cyclic heat engine?
A real heat engine is not cyclic.
An ideal heat engine converts all energy from heat to work.
A real heat engine is not isolated, so matter enters and leaves the engine.
An ideal heat engine is not isolated, so matter enters and leaves the engine.
Question 19 2 points Save
Which of the following is a way to improve the efficiency of a heat engine?
increase Qh
reduce Qh
reduce Wnet
increase Qc
Question 20 2 points Save
An electrical power plant manages to transfer 88 percent of the heat produced in the burning of fossil fuel to convert water to steam. Of the heat carried by the steam, 40 percent is converted to the mechanical energy of the spinning turbine. Which best describes the overall efficiency of the heat-to-work conversion in the plant?
greater than 88 percent
88 percent
40 percent
less than 40 percent
Question 21 2 points Save
What occurs when a system's disorder is increased?
No work is done.
No energy is available to do work.
Less energy is available to do work.
More energy is available to do work.
Question 22 2 points Save
Imagine you could observe the individual atoms that make up a piece of matter and that you observe the motion of the atoms becoming more orderly. What can you assume about the system?
It is gaining thermal energy.
Its entropy is increasing.
Its entropy is decreasing.
Positive work is being done on the system.
Question 23 2 points Save
Which of the following is not an example of approximate simple harmonic motion?
a ball bouncing on the floor
a child swinging on a swing
a piano wire that has been struck
a car's radio antenna waving back and forth
Question 24 2 points Save
Vibration of an object about an equilibrium point is called simple harmonic motion when the restoring force is proportional to
time.
displacement.
a spring constant.
mass.
Question 25 2 points Save
A mass attached to a spring vibrates back and forth. At the equilibrium position, the
acceleration reaches a maximum.
velocity reaches a maximum.
net force reaches a maximum.
velocity reaches zero.
Question 26 2 points Save
If a pendulum is adjusted so that its frequency changes from 10 Hz to 20 Hz, its period will change from n seconds to
n/4 seconds.
n/2 seconds.
2n seconds.
4n seconds.
Question 27 2 points
By what factor should the length of a simple pendulum be changed in order to triple the period of vibration?
3
6
9
27
Like that type of level.
thats one of the tests that i need done
Notorious_BLT
Active member
im in physics right now and have no idea what any of that ment
zepscratch
Active member
thats because girls arent smart, they just try really really hard
AhrenStein
Active member
haha
kinda true
kinda true
SteezePatrol
Active member
truely aced, as in 100%?
bigairjay.
Member
I got a 5 on the ap for B but I dont remember much. I know the first on is the W= area under PV diagram and +/- depends on which way it goes
akerbacker
Active member
i dont take physics, but that didnt seem that hard. actaully ya it did. google is the answer
ride_switch
Member
I took Physics C AP last year and got a 4 on the test. I don't feel like looking at those though.