What is the reason for the seasons on Earth?
a) Earth is cloest to the Sun in July, farthest from the Sun in January
b) Earth is tilted with respect to the Sun by about 23.5 degrees
c) Earth orbits the Sun more slowly in winter, faster in summer
d) Earth rotates more slowly in winter, faster in summer
e) Earth's Moon blocks more sunlight from reaching Earth in winter than in summer
Ans: b) Earth is tilted with respect to the Sun by about 23.5 degrees
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When you float in fresh water, the buoyant force that acts on you is equal to your weight. When you float higher in the denser water of the Dead Sea, the buoyant force that acts on you is
A) greater than your weight. B) less than your weight. C) equal to your weight.
A bar (L = 80 cm) moves on two frictionless rails, as shown, in a region where the magnetic field is uniform (B = 0.30 T) and into the paper. If v = 50 cm/s and R = 60 m?, what is the magnetic force on the moving bar?
A. 0.48 N to the right B. 0.48 N to the left C. 0.32 N to the left D. 0.32 N to the right E. None of the above
Aside from Earth, Venus is the most likely place for life to exist in the Solar System
a. True b. False Indicate whether the statement is true or false
The satellite Amalthea orbits Jupiter at just about the same distance in kilometers at which Mimas orbits Saturn. Yet Mimas takes almost twice as long to orbit
What can you deduce from this difference qualitatively? Since Jupiter and Saturn are not very different in radius, what else can you conclude?