The apollo program (not the lunar missions with astronauts) being conducted at the apache point observatory uses a 3.5-m telescope to direct lasers at retro-reflectors left on the moon by the apollo astronauts. if the moon is 384,472 km away, approximately how long do the operators need to wait to see the laser light return to earth?

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

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?