When most substances are heated, molecules inside move faster and take up more space, resulting in thermal
A) bending.
B) expansion.
C) contraction.
D) heat.
Answer: B
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When space probe Voyager 2 passed by Saturn, its speed increased (but not due to firing its engines). What must have happened?
A) Saturn must have lost a tiny bit of its orbital energy. B) Voyager 2 must have dipped through Saturn's atmosphere. C) Saturn's rotation must have sped up slightly. D) Saturn must have captured an asteroid at precisely the moment that Voyager 2 passed by.
The diagram below represents energy levels in a hydrogen atom. Each level is labeled with its energy (above the ground state of Level 1) in units of electron/volts (eV). The labeled transitions represent an electron moving between energy levels. Which transition, as shown, is not possible?
A) A B) B C) C D) D E) E
Life may be less likely around A- and F-type stars because
A) they emit large quantities of ultraviolet radiation B) they experience violent surface activity C) their habitable zones are very narrow D) rocky planets are unlikely to form around them
A mechanic is examining the wheel of a bicycle to adjust the brake. With the bicycle off the ground, he manually rotates the wheel until it reaches an angular speed of 12.0 rad/s and then allows it to coast to a stop
If the wheel has a moment of inertia of 0.100 kg ? m2, and the wheel slows uniformly to a stop in 160 s, what is the magnitude of the retarding torque? A) 1.00 N ? m B) 0.00750 N ? m C) 0.0787 N ? m D) 1.33 N ? m E) 1.67 N ? m