In science fiction movies, spaceships are often shown dodging through large numbers of closely spaced, boulder-size objects. Which of the following real things in our solar system would look most like such science fiction dangers?
A) the rings of Saturn
B) the asteroid belt
C) the atmosphere of Jupiter
D) the Oort cloud
A) the rings of Saturn
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Where would you have to live in order to have no circumpolar stars?
A) the equator B) the North or South Pole C) between the Arctic Circle and the tropic of Cancer D) between the Antarctic Circle and the tropic of Capricorn E) There will always be circumpolar stars wherever you live.
Amy, Brad, and Cate are walking (or running) along a straight line as shown below
The main practical problem associated with building an interstellar ramjet is
A) making the ship large enough to scoop up enough hydrogen fuel given that the density of hydrogen in space is so low B) producing enough thrust to accelerate the spacecraft to a high enough speed C) separating the matter and antimatter fuels from each other D) receiving enough photon energy to propel the craft
A wheel is spinning about a fixed axis in a clockwise direction at 20.0 revolutions per minute. There is a spot of paint on the wheel located 20.0 cm from the axis of rotation
Disregarding the phase of the motion and with the origin located at the center of the wheel, which of the following is a description of the motion of the paint spot projected onto a given direction in the plane of motion? A) x(t) = (20.0 cm)cos[(2.09 s-1)t] B) x(t) = (40.0 cm)cos[(0.333 s-1)t] C) x(t) = (20.0 cm)cos[(0.333 s-1)t] D) x(t) = (20.0 cm)cos[(20.0 s-1)t] E) x(t) = (40.0 cm)cos[(126 s-1)t]