PHY 121 Spring 2020 Exam 3 3) A 15.0 kg stone slides down a hill, leaving point A at a speed of 12.0 m/s. There is friction on the hill between points A and B, but there is no friction on the level ground at the bottom of the hill, between B and the wall. The energy lost due to friction in the hill section between points A and B is 1000 J. After entering the smooth horizontal region, the stone travels 100 m and then runs into a very long, light spring with force constant 5000 N/m

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.

If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?