Chapter 13: Question Preview (ID: 5981)

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What is the mechanical advantage of a single movable pulley
a) 1 b) 1.5 c) 2 d) 3
What is the mechanical advantage of a ramp 2.0 m long and 0.5 m tall
a) 1 b) 2.5 c) 4 d) none of the answers are correct
Lifting a car using a jack is easier because it requires
a) less force b) less work c) less time d) none of the answers are correct
a wedge is a modified
a) wheel and axle b) pulley c) inclined plane d) lever
what is the kinetic energy of a 1.4 kg discus with a speed of 22.5 m/2
a) 15.8 J b) 31.5 J c) 354 J d) 709 J
an inclined plane
a) changes the direction of the force only b) changes the magnitude of the force only c) changes both the direction and magnitude of the force d) decreases the amount of work done
what is the gravitational potential energy of a 54 kg box that is 8m above the ground
a) 5500 J b) 4300 J c) 3400 J d) 550 J
which of the following is an example of mechanical energy
a) nuclear energy b) potential energy c) chemical energy d) light energy
The efficiency of a ramp is 75%. If the amount of work input is 240 J, what is the amount of useful work output.
a) 320 J b) 310 J c) 240 J d) 180 J
If a person tries to life a heavy box for 5 seconds and can't make it budge, the work down is less than zero
a) true b) false c) d)
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