While standing in a low tunnel, you raise your arms and push against the ceiling with a force of 100 n. your mass is 70 kg. what force does the ceiling exert on you?

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .