Which of the following studies is best suited to astronomical observations that fall into the category called time monitoring?
A) studying how a star's brightness varies over a period of 3 years
B) studying how different planets differ in their surface compositions
C) measuring the rotation rate of a distant star
D) determining the age of the solar system
A) studying how a star's brightness varies over a period of 3 years
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When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, he doesn't slip off the skateboard because of
A) inertia in motion. B) momentum change. C) friction between his feet and the board.
Entropy is best defined as
A) the capacity to do work. B) energy that is due to its temperature. C) energy that is due to chemical structure. D) microscopic disorganization. E) microscopic organization.
What holds a circularly-moving satellite in orbit while the force of gravity pulls downward on it?
What will be an ideal response?
A 60.0-kg mass person wishes to push a 120-kg mass box across a level floor
The coefficient of static friction between the person's shoes and the floor is 0.700. What is the maximum coefficient of static friction between the box and the floor such that the person can push horizontally on the box and cause it to start moving? A) 0.333 B) 0.500 C) 0.350 D) 0.667 E) 0.700