hi all... here are some physics questions that i am puzzled on and lost. help! if you are able to solve them please show how, or at least what formulas/equations you used to get there. thanks! (even if you have a clue take a shot!anything could help). when a 0.64kg ball is dropped on your hand from 0.73m above it, your hand recoils 2.4cm before stopping. what is the average force on your hand while stopping the ball? the average density of the planet mercury is 5.61x10^3 kg/m^3. the acceleration due to gravity is 3.92 m/s^2. calculate the average radius of mercury. gold has a density of 1.74x10^3 kg/m^3. calculate the gravitational field strength 10m from a 1m cube of gold. the 3.56g bullet from a 22-250 rifle is fired vertically into a 1.174kg block of wood. the bullet sticks to the block, which rises 0.595m. what was the speed of the bullet at impact? what is the total energy stored in 1 kg of water? if an astronaut dropped a small rock on the surface of mars, how far would it fall in 1.00 seconds? the mass of mars is 0.107 that of earth and the radius of mars is 0.53 that of earth. an egg falls from a height of 3.0m. what speed will it have when it is 0.5m from the ground? calculate the mass of jupiter from the information that its moon Io orbits at an average distance of 4.22x10^5km from jupiter's center and has an orbital period of 42.5 hours. what would be the orbital period of an earth satellite that orbits 1/3 the distance to the moon? a spacecraft travelling at 0.8c away from the earth launches a probe that is travelling 0.95c from the spacecraft's frame of reference. what is the speed of the probe from the point of view of the earth? what is the acceleration due to gravity 1000km above the surface of the earth? any ideas?????