A 0.140-kg baseball is dropped from rest from a height of 2.00 m above the ground. What is the magnitude of its momentum just before it hits the ground?
A) 0.280 kg?m/s
B) 0.877 kg?m/s
C) 0.439 kg?m/s
D) 0.620 kg?m/s
E) 1.37 kg?m/s
B
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The radius of the earth’s (almost circular) orbit around the sun is 150,000,000 km, and it takes 1 y for the earth to go around the sun. Imagine that a certain satellite goes in an almost circular orbit of radius 15,000 km around the earth (this radius is 10,000 times smaller than the earth’s orbital radius around the sun). What is the period of this orbit?
A. 10-6 y B. 10-4 y C. 10-3 y D. 106 y E. These periods are not related in any simple way.
Why are there two tails to some comets?
A. The "dust tail" is formed by solar radiation pressure. The "gas tail," is pushed out by the solar wind. B. The "gas tail" is formed by solar radiation pressure. The "dust tail," is pushed out by the solar wind. C. Comets contain dense material which is attracted by the Sun's gravity, forming a tail which points toward the Sun. D. The statement is false: comets have only one tail.
The actual depth of a shallow pool 1.00 m deep is not the same as the apparent depth seen when you look straight down at the pool from above. How deep (in cm) will it appear to be? (nwater = 1.33.)
A. 133 B. 75.2 C. 90.6 D. 117 E. 100
The amplitude of a system moving with simple harmonic motion is doubled. The total energy will then be
a. 4 times as large b. 3 times as large c. 2 times as large d. the same as it was e. half as much