Additional Solved Problems Answers
Work: Constant Force
¢
How much work is done by the gravitational force when a 265-kg object falls
2.80
m?
¢
A 65.0-kg person climbs a flight of stairs 20.0 m high. How much work is
required?
¢ A box of mass 8.0 kg is accelerated by a force across a floor at a rate of 2.0 m/s2 for 7.0 s. Neglect friction.
Find the net work done on the box.
Potential Energy
¢
A spring has a spring stiffness constant,
k, of 440 N/m. How much must this
spring be
stretched to store 25 J of potential energy?
¢
A 7.0-kg monkey swings from one branch to another 1.2 m higher. What is the
change in potential energy?
Conservation of Mechanical Energy
¢ A skier, starting from rest, slides down a frictionless 35.0º slope whose vertical height is 185 m. How fast is he going when
he reaches the bottom of the incline?
¢ In the high jump, Ted’s kinetic energy is transformed into gravitational potential energy without the aid of a pole. With what minimum
speed must Ted leave the ground in order to lift his center of mass 2.10 m
and cross the bar with a speed of 0.70 m/s?