Author Question: Kepler improved the Copernican planetary hypothesis by a) putting the Sun at the center of our ... (Read 111 times)

jasdeep_brar · **on:** Jul 28, 2018

Kepler improved the Copernican planetary hypothesis by

a) putting the Sun at the center of our solar system.
b) putting Earth at the center of our solar system.
c) suggesting that the Sun rotates on its axis.
d) determining the true shapes of the planetary orbits.

Question 2

A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40 angle to the ground. The magnitude of the vertical impulse the catapult receives from the rock is
a. 5.1 104 N s.
b. 6.1 104 N s.
c. 8.0 104 N s.
d. 5.0 105 N s.
e. 6.0 105 N s.