Exam (elaborations)
Astro 7N Unit 1.
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Exam of 3 pages for the course ASTRO 7N 1 at ASTRO 7N 1 (Astro 7N Unit 1.)
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Astro 7N Unit 1according to newton's second law of motion, if the net force acting on the object increases
while the mass of the object remains constant, what happens to the acceleration? - correct
answer-acceleration increases
if the earth were moved to half its current distance from the sun, how would the force of
gravity by the sun on the earth change? - correct answer-it would be four times stronger
what did newton's law of universal gravitation tell us about how gravity works? - correct
answer-the force of gravity from the sun will be stronger on an object with more mass
the earth radius is about 6400 km. if you were in orbit in the space station 150 km above the
ground, the force of gravity you feel from earth would be - correct answer-slightly weaker
than when you are standing on earth
if you were to sit on the ground, there would be a force due to gravity pulling you toward the
earth. which of the following is true according to newton's 3rd law? - correct answer-you are
pushing the earth away from yourself with the same force
what would happen to the earth if the sun's gravity somehow turned off instantaneously? -
correct answer-it would continue to move in a line in the same direction it was moving when
the gravity turned off
consider a planet whose rotation axis is not tilted with respect to its orbital plan. what are the
seasons like on this planet? - correct answer-there are no seasons
if the earth rotated on its axis more slowly than it does now - correct answer-the days would
be longer
if earth had its orbit changed so that at all points along its orbit it were always the same
distance from the sun (circular orbit), how would this affect the seasons on earth? - correct
answer-they would be the same as they are now
a new planet orbits its star faster than the earth orbits the sun and it rotates more slowly than
the earth rotate. which of the following is true? - correct answer-the new planet has a shorter
year than earth and a longer day than earth
what time of year is it dark all day (and night) at the south pole of earth? - correct
answer-june
why isn't there an eclipse every month on earth - correct answer-the moon's orbit around
earth is actually tipped about 5 degrees to earth's orbit around the sun so the moon isn't
always in the right plane for an eclipse to occur
what is the inclination of mars? - correct answer-about 1 degree
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