The Jovian problem is that gas and dust disks may not last long enough for Jovian planets to form by accretion and then by gravitational collapse
a. True
b. False
Indicate whether the statement is true or false
True
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A helium-filled balloon released in the atmosphere will rise until
A) the pressure inside the balloon equals atmospheric pressure. B) atmospheric pressure on the bottom and top of the balloon are equal. C) the balloon and surrounding air have equal densities. D) all of the above E) none of the above
A heat pump has a coefficient of performance of 4 . If the heat pump absorbs 20 cal of heat from the cold outdoors in each cycle, the heat expelled (in cal) to the warm indoors is
a. 34 b. 27 c. 36 d. 40 e. 80
A metal blade spins at a constant rate of 5.0 revolutions per second about a pivot through one end of the blade. This rotation occurs in a region where the component of the earth's magnetic field perpendicular to the blade is 30 ?T. If the blade is 60 cm in length, what is the magnitude of the potential difference between its ends?
A. 0.24 mV B. 0.20 mV C. 0.17 mV D. 0.27 mV E. 0.34 mV
A ferromagnetic material is magnetized by the alignment of
a. domains. b. atoms. c. single magnetic dipoles. d. poles.