Ch. 17-Review: Question Preview (ID: 30648)

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The work output of a machine divided by the work input is the ________________ of the machine.
a) efficiency b) effort c) power d) resistance
The lowest possible temperature is ________________.
a) 0 b) -273 F c) 0 K d) -273 K
An inclined plane with one or two sloping sides forms a machine called a
a) pulley b) lever c) ramp d) wedge
A fixed, single pulley that is used to lift a block does which one of the following?
a) doubles the required to lift the block b) decreases the force required to lift the block c) makes the block easier to lift by changing the direction of the force needed to lift it d) decreases the force required and changes the direction of the force required
A place where molecules are far apart is a _______________________.
a) refraction b) reflection c) rarefaction d) compression
The rate at which work is done is calles __________________________.
a) efficiency b) effort time c) force d) power
Which one of the following in NOT an example of an electromagnetic wave?
a) sound wave b) x-rays c) red light d) gamma rays
A heat engine __________________.
a) changes mechanical energy to thermal energy b) changes mechanical energy into electrical energy c) changes thermal energy into mechanical energy d) changes kinetic energy into thermal energy
A machine that changes only the direction of a force has a mechanical advantage of _________.
a) 1 b) 2 c) 10 d) 100
A slanted surface used to raise an object is a(n) ____________________________.
a) efficiency board b) effort ramp c) inclined plane d) wedge
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