A 12.0 kg block sits at rest on a ramp. The ramp is at a 20.0" incline to the horizontal. What is the coefficient of static friction between the ramp and the block? Select one: O a. 2.75 O b. 2.53 O c. 0.532 O d. 0.364 An astronaut is in freefall in a spacecraft that is orbiting Earth. Which of the following statements is true for this astronaut? Select one: O a. The astronaut is truly weightless. O b. The net force on the astronaut is zero. O c. The astronaut has an apparent weight of zero. O d. The astronaut is accelerating at 9.81 m/s' toward Earth. If the separation distance between Earth and the moon is increased by a factor of 3, the magnitude of the gravitational field strength of the moon Select one: O a. is 1/3 of the original amount O b. is 1/9 of the original amount O c. is 3 times the original amount O d. is 9 times the original amountThe gravitational force between two people is 1.1 x 10"N. If person A has a mass of 75 kg and is 0.50 m away from person B, person B's mass is Select one: O a. 5.5 x 101 kg O b. 1.1x 103kg O c. 2.2 x 103kg O d. 3.1x 10' kg