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Q 1/24
Score 0
What is the smallest time in which a 900 W motor can lift a 3500 kg elevator to a height of 9.50 m?
30
293,265,000 seconds
362 seconds
368 seconds
3.89 seconds
Q 2/24
Score 0
How much work is required to lift a 25-kilogram mass to a height of 7 meters?
30
3.57 J
35 J
175 J
1,715 J
24 questions
Q.
What is the smallest time in which a 900 W motor can lift a 3500 kg elevator to a height of 9.50 m?
1
30 sec
Q.
How much work is required to lift a 25-kilogram mass to a height of 7 meters?
2
30 sec
Q.
Four machines do the amounts of work listed in the table shown. The time they take to do the work is also listed. Which machine develops the most power?
3
30 sec
Q.
Work is being done when a force
4
30 sec
Q.
The graph shows the force exerted on a block as a function of the block's displacement in the direction of the force. How much work did the force do in displacing the block 5.0 meters?
5
30 sec
Q.
Which pair of quantities can be expressed using the same units?
6
30 sec
Q.
How much work is done on a downhill skier by an average braking force of 9,256 newtons to stop her in a distance of 10 meters?
7
30 sec
Q.
Which action would require no work to be done on an object?
8
30 sec
Q.
A pendulum swings as shown in the diagram. At which position is the kinetic energy of the
pendulum bob the least?
9
30 sec
Q.
A pendulum swings as shown in the diagram. At which position is the gravitational potential energy of the
pendulum bob the least?
10
30 sec
Q.
If the speed of an object is doubled, its kinetic energy will be...
11
30 sec
Q.
A 75.0 kg person, starting from rest, slides down a slide 4.00 m long in 7 seconds. How much power is needed to stop the person from hitting the ground.
12
30 sec
Q.
A 1000 kg roller coaster travels over a 20.0 m tall hill and falls at a 5.00 m/s. What is the roller coasters KE?
13
30 sec
Q.
A student driving nails into a piece of wood lifts a 2.25 kg hammer 0.300 m above the top of a nail and then simply drops it on the nail. What is the gravitational PE of the hammer before he drops it down on the nail?
14
30 sec
Q.
According to the graph, the kinetic energy of the rock after 3 seconds is about ________.
15
30 sec
Q.
The SI unit for work is
16
30 sec
Q.
The SI unit for Power is
17
30 sec
Q.
The SI unit for energy (gravitational PE and KE) is
18
30 sec
Q.
The law of Conservation of energy basically says all energy on earth remains constant.
19
30 sec
Q.
If a rock falls from a cliff, at what point are its kinetic energy and its potential energy the same? Ignore air resistance. Assume the potential energy is relative to the bottom of the cliff.
20
30 sec
Q.
How much power does it take to lift a 1,000 N load 10 m in 20 s?
21
30 sec
Q.
Assume you can accurately measure the total kinetic and potential of a baseball at two different times while it is flying through the air. If you find that its total energy has decreased, what does that mean?
22
30 sec
Q.
55) According to the Law of Conservation of Energy, which of the following is NOT true?
