The Copernican model did not need to make use of epicycles
a. True
b. False
Indicate whether the statement is true or false
False
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The cosmic background radiation comes from a time after the origin of the universe
a. when protons and neutrons were first formed. b. when the big bang first began to expand. c. the inflationary period. d. when gamma rays had enough energy to destroy nuclei. e. when electrons began to recombine with nuclei to form atoms.
A 100-N force has a horizontal component of 80 N and a vertical component of 60 N. The force is applied to a cart on a level frictionless floor. The cart starts from rest and moves 2.0 m horizontally along the floor due to this force
What is the cart's final kinetic energy? A) 160 J B) zero C) 120 J D) 200 J
How does counting craters help us estimate the age of a moon's surface?
What will be an ideal response?
The San Andreas Fault was created
A) during the Cenozoic. B) by the collision of the eastward moving North American Plate and the Pacific ridge. C) by the same tectonic activity that formed the Gulf of California. D) by Cenozoic tectonic activity that also formed the Gulf of California as the North American Plate collided with the Pacific ridge.