Parallax measurements of the distances to the nearest stars use ________ as a baseline.
A. Earth's orbit
B. Earth-Moon distance
C. Earth's diameter
D. about the length of a football field
Answer: A
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I detect a star giving off more ultraviolet light than green light. What property of the star can I estimate with this information?
a) Its chemical composition b) Its temperature c) Its density d) Its age e) Its distance from Earth
A cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the
A) force against the cannon is smaller than against the ball. B) momentum is mainly concentrated in the cannonball. C) cannon has much more mass than the cannonball. D) momentum of the cannon is smaller.
Carnot Engine: The ocean thermal energy conversion project uses the surface water near tropical islands with a temperature of 20°C as the hot temperature reservoir, and the water at some depth, with a temperature of 5.0°C, as the cold temperature reservoir for a heat engine. What is the maximum possible efficiency of an engine running between those two temperatures?
A. 4.7% B. 5.1% C. 7.9% D. 15% E. 30%
Which travels with the greatest speed in a vacuum?
A) radio waves B) light waves C) X-rays D) gamma rays E) all have the same speed