Two horizontal curves on a bobsled run are banked at the same angle, but one has twice the radius of the other. the safe speed (for which no friction is needed to stay on the run) for the smaller radius curve is v. what is the safe speed on the larger radius curve?

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 .