Galileo challenged the idea that objects in the heavens were perfect by
A) showing that heavy objects fall at the same rate as lighter objects.
B) observing sunspots on the Sun and mountains on the Moon.
C) proving Kepler's laws were correct.
D) inventing the telescope.
B
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How many calories are equal to four BTU? (One calorie = 4.186 J, one BTU = 1 054 J.)
a. 1.007 b. 15.89 c. 1007 d. 1589
GPS satellites go around the earth in orbits that have a common radius of 26,600 km and a period of 12 h. Roughly how much less time would an atomic clock on a GPS satellite register between two events separated by exactly 24 h than clocks in the reference frame of the earth (ignoring gravitational effects on the satellite’s clock rate)?
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Which has the greater effect in cooling a substance, 1 g ice at 0°C or 1 g water at 0°C? Explain