A football is thrown upward at some angle above the horizontal. If we neglect air friction, then we can conclude that the acceleration vector of the football is
A. zero.
B. down.
C. opposite to the velocity vector.
D. along the direction of motion.
Answer: B
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A skater can spin faster by pulling her arms closer to her body or spin slower by spreading her arms out from her body. This is due to
A) the law of gravity. B) Newton's third law. C) conservation of momentum. D) conservation of angular momentum. E) conservation of energy.
A tank contains benzene, which has index of refraction 1.50. A dime is on the bottom of the tank. When viewed at normal incidence the dime appears to be 61 cm below the surface of the benzene. What is the actual depth of the benzene?
What will be an ideal response?
A heavily loaded boat is floating in a pond. The boat sinks because of a leak. What happens to the surface level of the pond?
a. It stays the same. b. It goes up. c. It goes down. d. More information is needed to reach a conclusion.
The third step in the precipitation-hardening process is to _________ the alloy to form the precipitate.
Fill in the blank(s) with the appropriate word(s).