What is spacetime?
A) Time that we measure when traveling in space.
B) It's a graph with four axes.
C) It is a way of viewing books at different angles.
D) The inseparable combination of space and time.
D
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Two life preservers have identical volumes, one filled with Styrofoam and the other filled with sand. When the two life preservers are worn by swimmers,
one swimmer floats with part of the preserver above water, and the other swimmer sinks. In this case the buoyant force is greater on the life preserver filled with A) Styrofoam. B) sand. C) same for both
What did the Voyager mission discover about the Cassini Division?
A) It actually contains one or more moons. B) It contains several ringlets. C) It is completely filled with a ring of very dark material. D) The spokes originate from it. E) It is actually completely empty of all ring material.
A 360-nm thick oil film floats on the surface of a pool of water water. The indices of refraction of the oil and the water are 1.5 and 1.33, respectively
When the surface of the oil is illuminated from above at normal incidence with white light, what are the two wavelengths of light between 400 nm to 800 nm wavelength that are most strongly reflected? A) 430 nm and 720 nm B) 450 nm and 740 nm C) 490 nm and 780 nm D) 410 nm and 700 nm E) 470 nm and 760 nm
In a greenhouse, electromagnetic energy in the form of visible light enters the glass panes and is absorbed and then reradiated. What happens to this reradiated electromagnetic radiation from within the greenhouse?
a. 100% returns to the atmosphere. b. It's partially blocked by glass. c. It's transformed into ultraviolet upon striking the glass. d. It's reflected as visible light upon striking the glass.