Why did Tycho conclude that the Sun revolves around the Earth?
A) He did not conclude that the Sun revolves around the Earth.
B) He could not detect the parallax of stars expected if the Earth revolves around the Sun.
C) He incorrectly measured the distance to the Sun and concluded it was in a low orbit around the Earth.
D) Long-held tradition prevented him from even considering the idea.
B
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A man lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m tall building. The bucket is initially at rest, but is traveling at 4.0 m/s when it reaches the top of the building
How much work was done by the man in lifting the bucket? A) 3.92 kJ B) 400 J C) 560 J D) 4.08 kJ E) 160 J
Two life preservers have identical volumes, one filled with Styrofoam and the other filled with sand. When each is worn by swimmers, one swimmer floats and the other sinks. Interestingly, the buoyant force is actually greater on the life preserver that
A) sinks. B) floats. C) same either way D) none of the above
If you wanted to observe stars behind a molecular cloud, in what wavelength of light would you most likely observe?
A) ultraviolet B) visible C) infrared D) X-ray E) gamma-ray
The resistance of most metals generally decreases with temperature
Indicate whether the statement is true or false