Find the radiation pressures (in atmospheres) on a totally absorbing surface and a totally reflecting surface. Answer in the order indicated. Express your answers in atmospheres separated by comma.

Aplanet of mass m 6.75 x 1024 kg is orbiting in a circular path a star of mass m 2.75 x 1029 kg. the radius of the orbit is r 8.05 x107 km. what is the orbital period (in earth days) of the planet tplanet?

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?