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Ch. 17-Review
Test Description: Part 1
Instructions: Answer all questions to get your test result.
1) The work output of a machine divided by the work input is the ________________ of the machine.
A
resistance
B
power
C
efficiency
D
effort
2) The lowest possible temperature is ________________.
A
-273 K
B
0
C
0 K
D
-273 F
3) An inclined plane with one or two sloping sides forms a machine called a
A
pulley
B
wedge
C
lever
D
ramp
4) A fixed, single pulley that is used to lift a block does which one of the following?
A
decreases the force required to lift the block
B
decreases the force required and changes the direction of the force required
C
doubles the required to lift the block
D
makes the block easier to lift by changing the direction of the force needed to lift it
5) A place where molecules are far apart is a _______________________.
A
rarefaction
B
reflection
C
compression
D
refraction
6) The rate at which work is done is calles __________________________.
A
efficiency
B
effort time
C
power
D
force
7) Which one of the following in NOT an example of an electromagnetic wave?
A
x-rays
B
gamma rays
C
sound wave
D
red light
8) A heat engine __________________.
A
changes mechanical energy into electrical energy
B
changes thermal energy into mechanical energy
C
changes kinetic energy into thermal energy
D
changes mechanical energy to thermal energy
9) A machine that changes only the direction of a force has a mechanical advantage of _________.
A
100
B
1
C
10
D
2
10) A slanted surface used to raise an object is a(n) ____________________________.
A
inclined plane
B
efficiency board
C
wedge
D
effort ramp
*select an answer for all questions
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