An astronaut drops a rock on the surface of an asteroid. the rock is released from rest at a height of 0.86 m above the ground, and hits the ground 1.37 s later. part a) what is the acceleration due to gravity on this asteroid?

Acricket ball of 70g moving with a velocity of 0.5 m/s is stopped by a player in 0.5s what is the force applied to stop the ball

Which situation will produce the greatest change of momentum

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.