Early historical models of the solar system were geocentric. Which of these phrases describes a geocentric solar system?
A. the sun as a reference point
B. existing in a star system
C. Earth as a reference point
D. circular, orbital path of travel

Apackage of supplies is dropped from a plane, and one second later a second package is dropped. neglecting air resistance, the relative velocity of the 1st package viewed from the second will 56) a) increase. b) be constant. c) be zero. d) depend upon their weight. e) decrease

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

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.