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Astro 7N UNIT #1 (PSU)
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Astro 7N UNIT #1 (PSU)
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Astro 7N UNIT #1 (PSU)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 become 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 toward the
Earth. Ehich 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 was turned off.
Consider a planet whose rotation axis is NOT tilted with respect to its orbital plane. What are
the seasons like on this planet? - correct answer-There are no seasons
If Earth rotated on its axis more slowly than it does now: - correct answer-its days would be
longer
If Earth had its orbit changed so that at all points along its orbit it was 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 right now.
A new planet orbits its star faster than the Earth orbits the sun and it rotates more slowly
then the Earth rotates. 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? - correct answer-June
If Earth's Moon was Full on May 1,2007. When was it next in the First Quarter phase after
this Full Moon? - correct answer-May 22
How much of the total surface area of the moon is illuminated by the Sunlight during the Full
Moon phase? - correct answer-one half
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