A merry-go-round is spinning at a fixed rate. As a person is walking toward the edge,
A) the force of static friction must increase in order for the person not to slide off.
B) the force of static friction must decrease in order for the person not to slide off.
C) the force of static friction such that the person does not slide off remains the same.
A
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Given that the planet orbiting the nearby star 51 Pegasi is about 20X larger than the Earth, but 400X more massive, on that world you would weigh
A) the same as you do here. B) twice as much as you do here. C) half as much as you do here. D) 20X more that you do here. E) 400X more than you do here.
There appears to be a correlation between the 22-year solar cycle and
A) droughts in North America. B) asteroid impacts on Earth. C) change of which political party has the majority in the U.S. Congress. D) the length of Mercury's day. E) the length of Saturn's year.
Which of these is the classic continuous spectrum?
A) sunlight B) a rainbow C) a neon light D) a fluorescent light E) a glowing nebula, such as M-42
The observed amount of difference between the perihelion of Earth in early January and aphelion in early July results in the northern hemisphere being _____
a. cold in January and hot in July b. hot in January and cold in July c. equally cold in both January and July d. equally hot in bot January and July e. Wrong! The seasonal differences in northern hemisphere temperatures is not caused by differences in distance from the Sun.