Astronaut Rachel leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth
Rachel's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year). According to Rachel, how long does the trip take?
A) 14 years
B) 15 years
C) 11 years
D) 4.2 years
E) 23 years
D
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Tarzan swings back and forth on a long vine. His friend Jane notices in amazement that he makes 30 complete swings in 2.4 minutes
(a) What is the frequency (in hertz) of Tarzan's swing? (b) How long is the vine he is using?
The main reason for building large optical telescopes on Earth's surface is
a. that there is a lot of money in science that needs to get spent. b. to collect as much light as possible from faint objects. c. to nullify the blurring effects of the Earth's atmosphere and thus produce higher resolution images. d. to bring astronomical objects closer to make them brighter. e. that the warm temperatures of the Earth's surface allow for easier telescope operation.
) A vertically oriented rocket that is able to sustain a continuous upward velocity of 8 km/s will
A) escape from Earth. B) be unable to escape Earth. C) eventually maintain a fixed orbit around Earth.
Two electric charges each equal to +Q, are separated by a distance d. If you make a graph of the electric potential as a function of the distance along the line connecting the two charges, the point exactly midway between the two charges would
A) be a relative maximum. B) be a relative minimum. C) be neither a relative maximum nor a relative minimum. D) oscillate between being a relative maximum and a relative minimum.