A Hooke's law spring is compressed a distance d and is used to launch a particle of mass m vertically to a height h above its starting position. Under double the compression, the spring is now used to launch a particle of mass 2m. How high does the second mass rise above its starting position?
a. h
b. 2h
c. 3h
d. 4h
b
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All the following statements about Venus are true. Which one offers evidence of a global repaving about a billion years ago?
A) Venus's largest features are three elevated regions that look somewhat like continents. B) Venus has many circular features, called coronae, which appear to be tectonic in origin. C) Venus appears to lack any water that could lubricate the flow of rock in its crust and mantle. D) Venus has relatively few impact craters and these craters are distributed fairly evenly over the entire planet.
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 ? above the floor. d. pushed by a force directed at an angle ? into the floor. e. turned on its side and pushed by a force parallel to the floor.
A piece of iron and a cup of water both at room temperature are heated such that the thermal energy of each doubles. Which has the higher temperature?
A) the water, because of its higher specific heat capacity B) the iron, because it doesn't change phase C) both the same D) none of the above
Which mission has recently provided scientists with information about Mercury's magnetic field?
a. Magellan b. MESSENGER c. LCROSS d. Voyager e. Apollo