In tests on earth a lunar surface exploration vehicle (mass=5.90*103 kg) achieves a forward acceleration of 0.220m/s2. to achieve this same acceleration on themoon, thevehicle's engines must produce a drive force of 1.43*103n. what is the magnitude of the frictional force that acts on thevehicle on the moon? all i know is it has something to do with the formulag=m1m2/r2. i figure the thefrictional force is th force opposing the drive force..i figured it out !

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.