In order to get an object moving, you must push harder on it than it pushes back on you
A) True
B) False
B
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An H-R diagram for a globular cluster will show a horizontal branch, which is a line of stars above the main-sequence but to the left of the subgiants and red giants. Which of the following statements about these horizontal branch stars is true?
A) They have inert (nonfusing) carbon cores. B) Their sole source of energy is hydrogen shell fusion. C) They generate energy through both hydrogen fusion and helium fusion. D) In a particular star cluster, all horizontal branch stars have the same spectral type.
Magnetic confinement is used in controlled fusion experiments to
a. provide neutrons. b. accelerate nuclei. c. control a plasma. d. excite nuclei into higher energy levels. e. inject energy into nuclei.
A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the mass is at the highest point of the circle the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?
a. 21 N b. 11 N c. 16 N d. 26 N e. 36 N
While there is no doubt that global temperatures are increasing, it is
A) now becoming clear that human activity is indeed a major contributor to global warming B) now becoming clear that this effect is due to the slow brightening of the Sun C) now certain that human activity has no effect on the Earth's climate D) still not clear whether human activity is affecting the climate at all