The frictional force of the floor on a large suitcase is least when the suitcase is
a. pushed by a force parallel to the floor.
b. dragged by a force parallel to the floor.
c. pulled by a force directed at an angle q above the floor.
d. pushed by a force directed at an angle q into the floor.
e. turned on its side and pushed by a force parallel to the floor.
C
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Mercury is larger than Earth's Moon but smaller than Earth
a. True b. False Indicate whether the statement is true or false
A saber-toothed-tiger's bones contain 1/32 of the amount of 14C that is contained in the bone material of living animals. The half-life of 14C is 6000 years. From this information, we can conclude
A) that the tiger died about [i.e., plus or minus a few thousand years] 42,000 years ago. B) nothing at all, because 14C dating is known to be inaccurate. C) nothing at all, because of the uncertainties associated with radioactive decay. D) that the tiger died about 18,000 years ago. E) that the tiger died about 30,000 years ago.
A boulder is thrown into a deep lake. As it sinks deeper and deeper in the water the buoyant force
1) increases. 2) decreases. 3) remains the same. This is because the 4) pressure increases with greater depth. 5) pressure decreases with greater depth. 6) volume and weight of displaced water are the same at any depth.
A 0.28-kg stone you throw rises 34.3 m in the air. The impulse your hand receives from the stone while it throws the stone is
a. 2.7 N s, up. b. 2.7 N s, down. c. 7.3 N s, up. d. 7.3 N s, down. e. 9.6 N s, up.