Picnickers see a lightning flash of an approaching thunderstorm and hear the thunder 8.0 s later
a. Approximately how far away, in miles, is the storm?
b. If the storm is moving at a speed of 10 mi/h and the picnickers take 20 minutes to finish eating and pack, will they get wet?
a. 1.6 mi
b. Yes
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Two pieces of optically flat glass (n = 1.50 ) touch at one edge and a separated by a thin stretched fiber at the opposite edge. Light of wavelength 500 nm is shone from above and 100 dark fringes are counted. How thick is the fiber?
A) 13 ?m B) 100 ?m C) 5 ?m D) 50 ?m E) 25 ?m
If the tilt of Earth's rotation axis was increased from 23.5° to 40°, what would we expect to change?
A) Seasons on Earth would become more extreme (hotter summers, colder winters). B) Seasons on Earth would become less extreme (cooler summers, warmer winters). C) The Earth would not experience seasons anymore. D) Nothing would change about weather on Earth.
Olber's Paradox is solved in part by the fact that the universe is neither infinitely large nor infinitely old
Indicate whether the statement is true or false
Suppose a box contains about 5.0 × 10^21 hydrogen atoms at room temperature (21°C). Determine the thermal energy of these atoms
a. 10 J b. 20 J c. 30 J d. 5.0 J e. 1.0 J