Suppose it is January and the Sun remains above your horizon all day long. Where must you be located?
A) somewhere between the Antarctic Circle and the South Pole
B) at the South Pole
C) somewhere between the Arctic Circle and the North Pole
D) at the North Pole
A) somewhere between the Antarctic Circle and the South Pole
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A person is dragging a packing crate of mass 100 kg across a rough horizontal floor where the coefficient of kinetic friction is 0.400. He exerts a force F sufficient to accelerate the crate forward
At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration? A) 21.8° B) 27.7° C) 30° D) 34.5° E) 45°
How far does light travel in 100 years?
A: 100 miles. B: 100 wavelengths. C: 100 light years. D: 100 astronomical units. E: 100 parsecs.
There was a very rapid expansion period called inflation early in the history of the universe. When was this?
A: 10^43 to 10^42 seconds B: 10^35 to 10^33 seconds C: 10^12 to 10^11 seconds D: 1^3 seconds E: 100^200 seconds
Since the rate of heat transfer by conduction is proportional to the ?T, what percent savings in your heating bill would you expect if you turned the thermostat down from 75° to 65°F, and the outside temperature is 25°F?
a. 10% b. 20% c. 30% d. 40% e. 50%