Astro 7N Unit 1 UPDATED ACTUAL Exam
Questions and CORRECT Answers
according 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
how often does mar's moon, phobos, eclipse? - CORRECT ANSWER - every orbit
how long is phobos orbit around mars? - CORRECT ANSWER - about 8 hours
do you see which way the stars are moving as the movie plays? - CORRECT ANSWER -
east to west
do you see which way the north celestial pole (the point at the tip of the arrow just above n) is
moving as the movie plays? - CORRECT ANSWER - it remains in place
summer solstice: the ____ right? - CORRECT ANSWER - june 21
autumnal equinox -- that's on or about ____ right? - CORRECT ANSWER - september 22
Questions and CORRECT Answers
according 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
how often does mar's moon, phobos, eclipse? - CORRECT ANSWER - every orbit
how long is phobos orbit around mars? - CORRECT ANSWER - about 8 hours
do you see which way the stars are moving as the movie plays? - CORRECT ANSWER -
east to west
do you see which way the north celestial pole (the point at the tip of the arrow just above n) is
moving as the movie plays? - CORRECT ANSWER - it remains in place
summer solstice: the ____ right? - CORRECT ANSWER - june 21
autumnal equinox -- that's on or about ____ right? - CORRECT ANSWER - september 22
