Out in space, an astronaut exerts a force of 400N on a 500 g rock, causing it to gain speed from 3 m/s to 8 m/s. How
much time must this have taken? (watch your units)

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600