The gravitational constant G in the law of universal gravitation
A. is believed to be constant with time.
B. is believed to have the same value throughout space.
C. leads to a determination of the mass of Earth.
D. All of the above are true.
Answer: D. All of the above are true.
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When water is turned on in a shower, the shower curtain moves towards the water spray. This partly involves
A) capillary action. B) surface tension. C) pressure changes in moving fluids. D) none of the above
Which of the following best describes how the greenhouse effect works?
A) Greenhouse gases absorb X-rays and ultraviolet light from the Sun, and this absorbed radiation then heats the atmosphere and the surface. B) A planet's surface absorbs visible sunlight and returns this absorbed energy to space as infrared light. Greenhouse gases slow the escape of this infrared radiation, which thereby heats the lower atmosphere. C) Greenhouse gases absorb infrared light coming from the Sun, and this absorbed sunlight heats the lower atmosphere and the surface. D) The greenhouse effect is caused primarily by ozone, which absorbs ultraviolet light and thereby makes the atmosphere much hotter than it would be otherwise.
A light bulb, sold as long-lasting, is rated 120 W at 130 V. The "increased" lifetime comes from using it at 120 V. Assuming negligible change in resistance at the different voltage, what is its power consumption at 120 V?
a. 92 W c. 108 W b. 102 W d. 85 W
An electric motor can be manually turned and made to act as a generator
Indicate whether the statement is true or false