Kinetic energy and potential energy#2
1. if each story is 2.50 m high, what is the gravitational potential energy of a 61.2 kg person standing on the
roof of a 10-story building relative to:
a. the tenth floor (15300 j)
b. the sixth floor (9180 j)
c. the first floor (1530 )

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.