A spaceship is descending to the surface of Mars where g= 4 m/sec. The spaceship is initially 80 m above the planet's surface and is descending downward at 50 m/sec. The mass of the spaceship is 2500 kg. The spaceship will land on the surface with a final velocity of 0. Our goal s to find the upward thrust force on the spaceship to make this happen. a) Find the deceleration of the rocket. b) Show the net force. d) Find the thrust force on the rocket?

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?