Due to its elliptical orbit, Mars is closer to the Sun on average during summer in the Southern Hemisphere. This means Southern Summer on Mars will be
A) short and hot
B) long and hot
C) long and mild
D) short and mild
A
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A steel ball has a mass equal to 5 kilograms. What is the ball's weight?
What is the Great Wall?
A) It is a ridge on the Moon near the crater Birt. B) It is the distance beyond which astronomers cannot view any more galaxies or even quasars. C) It is a large sheet of galaxies. D) It is the time before the universe started expanding, about which we can never know anything. E) It is an enormous intergalactic cloud of dust and gas that hides more distant galaxies.
Objects in the Kuiper belt
A) are in random orbits at all inclinations to the ecliptic. B) are the sources of long-period comets. C) lie beyond the orbit of Neptune, and close to the ecliptic. D) are dense, like the iron meteorites. E) lie beyond the orbit of Neptune and perpendicular to the ecliptic.
Newton's Second Law in 1 Dimension: A box of mass 72 kg is at rest on a horizontal frictionless surface. A constant horizontal force of magnitude F then acts on the box, accelerating it to the right. You observe that it takes the box 3.4 seconds to travel 13 meters. What is the magnitude of the force F?
Fill in the blank(s) with the appropriate word(s).