According to Newton's Law of Universal Gravitation, if the Moon were three times further from Earth, the force by Earth on the Moon would:
A) increase by a factor of 3.
B) decrease by a factor of 3.
C) increase by a factor of 9.
D) decrease by a factor of 9.
E) stay the same.
D
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An object is acted on by a drag force with a magnitude that is proportional to the speed. The object accelerates downward at 3.00 m/s2 when it is falling with a speed 20.0 m/s. What is the terminal speed of the object as it is falling?
A) 38.1 m/s B) 55.9 m/s C) 28.8 m/s D) 65.4 m/s E) 43.2 m/s
Constant Acceleration Kinematics: An object is moving in a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?
A. 30 m B. 39 m C. 48 m D. 57 m
Experiments allow physicists today to reproduce (on very small scales) energy and temperature conditions thought to have prevailed in the early universe as far back in time as about
A) one ten-billionth (10-10) of a second after the Big Bang. B) 380,000 years after the Big Bang. C) 10-45 seconds after the Big Bang. D) 10 billion years ago.
The Big Bang predicts that after the universe was born it
A) consisted of an equal mixture of all the chemical elements B) was completely empty C) consisted of mostly hydrogen and helium D) consisted of mostly carbon, hydrogen, oxygen and nitrogen