A line drawn through locations of equal atmospheric pressure is a(n)
a. equipress.
b. anemometer.
c. wind vane.
d. isobar.
d
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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
The greater the mass of a star, the _______________ it moves through its life cycle
a. faster b. slower c. Neither of these; mass has no effect on the life cycle of a star.
According to special relativity, what is the speed of light measured in a space ship traveling at 0.40 c?
A. 0.60 c B. 1.4 c C. 0.86 c D. 1.0 c E. None of these choices are correct.
The acceleration of gravity on Earth's surface is 9.8 m/s2. What is the acceleration of gravity at a height of 6,400 km above Earth's surface? (Hint: recall the 1/r2 dependence and note that Earth's radius is 6,400 km.)
A. 19.6 m/s2 B. 2.45 m/s2 C. 9.8 m/s2 D. 4.9 m/s2