A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0 s, assuming negligible air resistance?
A) 9.8 m/s upward
B) 9.8 m/s downward
C) 0 m/s
D) 19.6 m/s downward
B
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Reactance: The inductor in a radio receiver carries a current of amplitude 0.200 A when an ac voltage of amplitude 2.40 V is across it at a frequency of 1400 Hz. What is the value of the inductance?
A. 1.43 mH B. 1.36 mH C. 9.20 mH D. 4.42 mH E. 1.97 mH
The surface of Venus is much hotter than the Earth because it
A) has no magnetic field B) has a very thick atmosphere of carbon dioxide C) has a much higher rate of volcanic activity D) is closer to the Sun
The solar winds blow outward from
A) coronal holes. B) sunspots. C) flares. D) the entire photosphere. E) the Sun's poles only.
Two solid spheres are made from the same material, but one has twice the diameter of the other. Which sphere will have the greater bulk modulus?
A) the smaller one B) the larger one C) It will be the same for both spheres.