The proton-proton chain is
A) the specific set of nuclear reactions through which the Sun fuses hydrogen into helium.
B) the linkage of numerous protons into long chains.
C) another name for the force that holds protons together in atomic nuclei.
D) an alternative way of generating energy that is different from the fusion of hydrogen into helium.
A
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A coil is rotated in a magnetic field generating an emf given by emf = NBA? sin ?, where ? = ?t. At which angle ? is the emf one-third of its maximum value?
a. 0° b. 19.5° c. 6.4° d. 70.5° e. 60.0º
When carbon combines with oxygen, energy is released to the surroundings. Thus this reaction
a. is an acid–base reaction. b. is endothermic. c. never reaches equilibrium. d. is exothermic.
In Vienna, there is a Ferris wheel designed so that the passengers ride in a standing position. If one of the passengers were standing on a bathroom scale while the ride rotated at a constant speed, the scale would read lowest at
A. the lowest point in the ride. B. the point in the ride where they were ascending most rapidly. C. the highest point in the ride. D. the point in the ride where they were descending most rapidly.
In Figure 4.2, the blocks and rod assembly move upward at constant velocity. The force in link A is closest to:
A) 39 N B) 41 N C) 43 N D) 45 N E) 47 N