Energy Conservation With Nonconservative Forces: If a stone is dropped with an initial gravitational potential energy of 100 J but reaches the ground with a kinetic energy of only 75 J, this is a violation of the principle of conservation of energy.
A. True
B. False
Answer: B
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Which of the following gives evidence of the solar wind?
A. the tails of comets B. solar flares C. solar prominences D. sunspots E. jet streams on Earth
Tripling the focal length of a telephoto lens, while holding aperture size constant, will change the light intensity admitted to the film by what factor?
a. 0.11 b. 0.33 c. 3.0 d. 9.0 e. 0.50
In an LCR series circuit with XL > XC, the phase angle between the current and voltage phasors is 30°. If the AC frequency doubles, what is the magnitude of the resulting phase angle?
a. 30° b. less than 30° c. more than 30° d. Additional information is needed to reach a determination.
The surface of Venus is hotter than the surface of Mercury
a. True b. False Indicate whether the statement is true or false