Which of these electromagnetic waves has the shortest wavelength? radio waves infrared waves x-rays ultraviolet waves light waves?

A10.0 kg cart and a 15kg cart are locked together with a compressed spring between them. they are then released so that the spring pushes the two carts apart. the 10.0 kg cart is moving at 4.5 m/s afterward. how fast is the 15kg cart moving? 3.0 m/s 2.0 m/s 4.5 m/s 5.0 m/s

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

What is the measure of a change in an objects velocity?