Which of the following objects is an example of a luminous source? a. sun

b. moon

c. desk

d. all of these

e. none of these

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not

A14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.