3.A worker pushes a sled with a force of 40 N over a level distance of 6.0 m. If

Question

3.A worker pushes a sled with a force of 40 N over a level distance of 6.0 m. If a frictional force of 24 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow? PLEASE SHOW WORK!

a.240 J

b.216 J

c.144 J

d.96 J

11.Which of the following is that form of energy associated with an object's location in a conservative force field?

a.potential

b.thermal

c.bio-chemical

d.kinetic

25.As an object is lowered into a deep hole in the surface of the earth, which of the following must be assumed in regard to its potential energy?

a.increase

b.decrease

c.remain constant

d.cannot tell from the information given

33.A simple pendulum, 2.0 m in length, is released by a push when the support string is at an angle of 25 degrees from the vertical. If the initial speed of the suspended mass is 1.2 m/s when at the release point, to what maximum angle will it move in the second half of its swing? PLEASE SHOW WORK!

a.37 degrees

b.30 degrees

c.27 degrees

d.21 degrees

52.Adisa pulls a 40-N crate up a 5.0-m long inclined plane at a constant velocity. If the plane is inclined at an angle of 37 degrees to the horizontal and there is a constant force of friction of 10 N between the crate and the surface, what is the net change in potential energy of the crate? PLEASE SHOW WORK!

a.120 J

b.120 J

c.200 J

d.200 J

Explanation / Answer

1.W=24*6=144 J 2 a.potential 3 b.decrease 4 5 P=40l sin 37=120

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