Which of the following has potential energy? a cup sitting on the ground a kite resting on the ground a person standing still a kite flying in the air

Observations show that interstellar clouds can have almost any shape and

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?

What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?