1) A woman does 150 J of work to move a table 2 m across the floor. What is the magnitude of the force that the woman applied to the table if this force is applied in the horizontal direction?
1) A woman does 150 J of work to move a table 2 m across the floor. What is the magnitude of the force that the woman applied to the table if this force is applied in the horizontal direction?
2) A rope applies a horizontal force of 290 N to pull a crate a distance of 3 m across the floor. A frictional force of 80 N opposes this motion.
a. What is the work done by the force applied by the rope?
b. What is the work done by the frictional force?
c. What is the total work done on the crat
3) A net force of 70 N accelerates a 3-kg mass over a distance of 12 m.
a. What is the work done by this net force?
b. What is the increase in kinetic energy of the mass
4) A box with a mass of 6.0 kg is lifted (without acceleration) through a height of 2.0 m, in order to place it upon the shelf of a closet.
a. What is the increase in potential energy of the box?
b. How much work was required to lift the box to this position?
5) To stretch a spring a distance of 0.20 m from the equilibrium position, 60 J of work is done.
a. What is the increase in potential energy of the spring?
b. What is the value of the spring constant k of the spring
6) At the low point in its swing, a pendulum bob with a mass of 0.2 kg has a velocity of 4 m/s.
a. What is its kinetic energy at the low point?
b. Ignoring air resistance, how high will the bob swing above the low point before reversing direction
7) A sled and rider with a combined mass of 50 kg are at the top of a hill a height of 8 m above the level ground below. The sled is given a push providing an initial kinetic energy at the top of the hill of 900 J.
a. Choosing a reference level at the bottom of the hill, what is the potential energy of the sled and rider at the top of the hill?
b. After the push, what is the total mechanical energy of the sled and rider at the top of the hill?
c. If friction can be ignored, what will be the kinetic energy of the sled and rider at the bottom of the hill
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