a compressed spring has 30 jules of energy. the spring does 30 jules of work on the cart. It initially had no energy. How much energy does the cart have now?

The earth remains in orbit around the sun due to the force of gravity. how does the force of gravity exerted by the sun on the earth compare to the force of gravity exerted by the earth on the sun?

Which of the following is an example of motion in two dimensions?

A2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kn. what is the frequency of the fundamental mode of vibration of this wire?