During the expansion of the early universe, which two interactions were the last to separate? a. the strong and weak interactions b. the gravitational and strong interactions c. the electromagnetic and weak interactions or d. the electromagnetic and gravitational interactions

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 .