While the gondola is rising at a speed of 2.0 m/s, a passenger in a balloon-supported gondola throws a small ball down at a speed of 5.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
a. 2.0 m/s, up.
b. 3.0 m/s, down.
c. 3.0 m/s, up.
d. 5.0 m/s, down.
e. 12.8 m/s, down.
b
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The fact that the sky is dark at night proves that the universe cannot be
A) eternal and unchanging with an infinite number of stars. B) expanding. C) more than 20 billion years old. D) infinite in size.
Consider two main sequence K-stars of equal mass. Each star has been measured for a periodic wobble in its velocity curve, with one having a period of 1 month and the other having a period of 2 months
Which star has the closest planet (the planet with the smallest orbit)? A) the star with a period of 1 month B) the star with a period of 2 months C) The planet orbit sizes can't be determined from the information provided.
A steel bridge is 1000 m long at -20°C in winter. What is the change in length when the temperature rises to 40°C in summer? The average coefficient of linear expansion of this steel is 11 × 10-6 K-1
A) 0.33 m B) 0.44 m C) 0.55 m D) 0.66 m
The source of all wave motion is
A) a wave pattern. B) a harmonic object. C) something vibrating. D) a region of variable high and low pressure. E) none of the above