Two blocks are released from the top of a building. One falls straight down while the other slides down a smooth ramp. If all friction is ignored, which one is moving faster when it reaches the bottom?
a. The block that went straight down.
b. The block that went down the ramp.
c. They both will have the same speed.
d. Insufficient information to work the problem.
c
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Indicate whether the statement is true or false
What is the exosphere?
A) the lowest layer in the atmosphere B) the part of the atmosphere that absorbs optical light C) the part of the atmosphere that absorbs ultraviolet D) the part of the atmosphere in which the greenhouse effect is strongest E) the outermost, very low-density region of the atmosphere
A board that is 20.0 cm wide, 5.00 cm thick, and 3.00 m long has a density 350 kg/m3. The board is floating partially submerged in water of density 1000 kg/m3. What fraction of the volume of the board is above the surface of the water?
A) 0.350 B) 0.650 C) zero D) 0.200 E) The answer depends on which edge of the board is vertical.
A stone is lifted and released so that it falls to the ground. According to Galileo, it fell because
A) of its inertia. B) of electrical attraction. C) its natural motion is to fall. D) of friction. E) of gravity.