The pressure at the bottom of aquarium A is greater than that at the bottom of aquarium B. Why might this be?
a. A is filled with fresh water, B has the same amount of salt water.
b. A is filled to a greater depth than B.
c. A has greater volume than B.
d. The bottom of aquarium A has smaller area than that of B.
e. none of the above
B
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Electromagnetic waves can be produced by
A) electric charges moving with constant velocity. B) electric charges at rest. C) electric charges in accelerated motion. D) All of the previous answers are correct. E) None of the previous answers is correct.
You push downward on a trunk at an angle 25° below the horizontal with a force of 750N If the trunk is on a flat surface and the coefficient of static friction between the surface and the trunk is 0.61,
what is the most massive trunk you will be able to move? A) 81 kg B) 73 kg C) 112 kg D) 93 kg
Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard. The reason he doesn't slip off the skateboard is due to
A) inertia in motion. B) momentum change. C) friction between his feet and the board.
What do asteroids and comets have in common?
A) They have similar densities. B) They have similar orbital radii. C) Most are unchanged since their formation in the solar nebula. D) They have a similar range of orbital inclinations. E) They have nothing in common with each other.