If a solid disk and a hoop are to have the same mass and rotational inertia, then the hoop must have a ________ radius.
Fill in the blank(s) with the appropriate word(s).
smaller
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The buildup of thermal energy in a collapsing gas cloud leads to thermal pressure that can halt the gravitational collapse. What must happen for the gravitational collapse to continue?
A) The cloud must radiate away some of its thermal energy. B) The cloud must gain mass. C) The cloud must have a very strong magnetic field. D) The cloud must get a push from the radiation of nearby hot, young stars.
Two particles, each having a mass of 3.0 ?g and having equal but opposite charges of magnitude 5.0 nC, are released simultaneously from rest when the two are 5.0 cm apart. What is the speed of either particle at the instant when the two are separated by 2.0 cm?
A. 2.1 m/s B. 1.5 m/s C. 1.8 m/s D. 2.4 m/s E. 3.2 m/s
The compressions and rarefactions in a longitudinal wave travel in
A) the same direction. B) opposite directions. C) a vacuum.
The primary source of the energy radiated by a star, such as the sun, is
A) fusion reactions in which helium is fused to form iron. B) fusion reactions in which hydrogen is fused to form helium. C) beta decay. D) fission reactions involving uranium. E) alpha decay.