The diagram shows a planet at four positions in its orbit. At which position does it have the greatest gravitational potential energy?
A) 1
B) 2
C) 3
D) 4
E) The gravitational potential energy is the same at all four positions.
C) 3
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Polarization: As shown in the figure, the orientation of the transmission axis for each of three ideal polarizing sheets is labeled relative to the vertical direction. A beam of light, polarized in the vertical direction, is incident on the first polarizer with an intensity of 1.00 kW/m2. What is the intensity of the beam after it has passed through the three polarizing sheets when ?1 = 30°, ?2 = 30°, and ?3= 60°?
A. 141 W/m2 B. 316 W/m2 C. 433 W/m2 D. 563 W/m2 E. 188 W/m2
The weight of an object equals its mass times the acceleration of gravity
Indicate whether the statement is true or false
Does the fact that the mantle is beneath the crust necessarily mean that the mantle is denser than the crust? Explain
What will be an ideal response?
Each Voyager spacecraft carries a "postcard" designed to be understandable to any aliens that might someday encounter it. On the "postcard," scientists pinpointed the location of Earth by triangulating it between pulsars. Why did the scientists choose pulsars rather than some other type of star?
A) Pulsars are easy to identify by their almost perfectly steady periods of pulsation. B) Pulsars are very bright and therefore easy to find. C) Several pulsars are located within a dozen light-years of our solar system, making them useful for finding our solar system. D) We're pretty sure that aliens will have only radio telescopes and not optical telescopes, so they'll have a better chance of seeing pulsars than ordinary stars.