If Nellie hangs from a horizontal bar that is supported by four vertical ropes, the tension in the ropes
A) are each half her weight.
B) are each equal to her weight.
C) add to equal her weight.
D) none of the above
Answer: C
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Which of the following best explains why the Sun's luminosity gradually rises over billions of years?
A) Fusion gradually decreases the number of independent particles in the core, allowing gravity to compress and heat the core, which in turn increases the fusion rate and the Sun's luminosity. B) Nuclear reactions in the Sun become more efficient with time, so that each fusion reaction releases more energy when the Sun is old than when it is young; this in turn raises the Sun's luminosity. C) The Sun's core gradually expands with time, and this expansion means there is more room for energy to be generated and hence increases the Sun's luminosity. D) The planets need more and more energy to maintain any life on them as time goes on, and therefore the Sun must bet hotter.
Which of these colors of light has photons of lowest energy?
a. Blue b. Green c. Yellow d. Red
A hydraulic lift raises a 2 000-kg automobile when a 500-N force is applied to the smaller piston. If the smaller piston has an area of 10 cm2, what is the cross-sectional area of the larger piston?
a. 40 cm2 b. 80 cm2 c. 196 cm2 d. 392 cm2 e. 160 cm2
The energy transformation that occurs during downhill skiing is
A) kin E ? grav E. B) chem E ? kin E + therm E. C) kin E ? grav E + therm E. D) grav E ? chem E. E) grav E ? kin E + therm E.