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Conservation of Momentum Answers

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If 3,600 J of work is done in 3.0 s, what is the power?

A
0.00083 W
B
1,200 W
C
3,600 W
D
11,000 W
2
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Luke pulls a sled using a force of 65 N for a distance of 25 m across level ground. The rope Luke pulls forms an angle of 25° with the ground.

A
250 J
B
690 J
C
1,500 J
D
1,600 J
3

Why is it important to know the direction of the force applied to a moving object and the direction in which the object is moving when determining the work done on the object?

A
Only the component of the force perpendicular to the motion is used to calculate the work.
B
If the force acts in the same direction as the motion, then no work is done.
C
When there is an angle between the two directions, the cosine of the angle must be considered.
D
A force at a right angle to the motion requires the use of the sine of the angle.
4

A moving company collects data about couches they move and displays the data in a table. The force along the ramp, the angle of the ramp, and the height the couch is raised from the ground to the platform is shown below. Which statements correctly compare the work done to move the couches? Select three options.The same amount of work is done for couches 1 and 3.The same amount of work is done for couches 2 and 3.The work for couch 1 is greater than the work for couch 2.The work for couch 2 is less than the work for couch 3.The work for couch 3 is greater than the work for couch 1.The work for couch 2 is greater than the work for couch 1.

Question illustration
A
The same amount of work is done for couches 1 and 3.
B
The same amount of work is done for couches 2 and 3.
C
The work for couch 1 is greater than the work for couch 2.
D
The work for couch 2 is less than the work for couch 3.
E
The work for couch 3 is greater than the work for couch 1.
F
The work for couch 2 is greater than the work for couch 1.

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