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ASTRO 7N 1
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Exam of 21 pages for the course ASTRO 7N 1 at ASTRO 7N 1 (ASTRO 7N 1)
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ASTRO 7N 1The force of gravity by the Sun keeps the planets in orbit around it, but how do the planets
affect the Sun? - correct answer-They exert an equally strong pull on the Sun, causing it to
move slightly.
If I apply the exact same amount of force to a peddle and a bolder, what will happen? -
correct answer-The peddle will move faster.
How high are you jumping at twice Earth's mass compared to Earth's mass? - correct
answer-Half as high.
Since the jump height is half as high, what does that tell us about the gravity? - correct
answer-Twice as much
After changing the mass to 0.5 M, how much higher are you jumping than at Earth's mass? -
correct answer-Twice as high
Change the mass to 0.75 M. How much higher are you jumping? - correct answer-Four
times as high
As the mass of the planet increases, the jump height decreases by the same factor at the
mass. - correct answer-:)
Increasing mass, decreases the jump height.
The mass of a planet and the jump height are inversely related. - correct answer-:)
Keeping the mass at Earth's mass, but changing the radius to half of the radius of Earth.
How much higher do you jump? - correct answer-One quarter as high
With the same mass, but a smaller radius, we jump... - correct answer-Less
Let's keep the mass at Earth's mass but change the radius to twice the radius of Earth. How
high do you jump? - correct answer-Four times as high
With the same mass but a radius twice that of Earth, we are jumping... - correct answer-Four
times as high
Let's keep the mass at Earth's mass but change the radius to three times the radius of Earth.
How high do you jump? - correct answer-Nine times as high
As the radius of the planet increases, the jump height increases as the square of the radius.
- correct answer-:)
Gravity is inversely proportional to the square of the radius. - correct answer-:)
,From the relationship between gravity and radius and the relationship between mass and
gravity, we learned earlier, what is the relationship between gravity, mass, and radius? -
correct answer-g ∝ m/r^2
Experiment using Mars' and Earth's gravity to see what effect they have on gravity. What is
its surface gravity compared to Earth? (Mars has about 1/10 the mass and 1/2 the radius of
Earth.) - correct answer-0.4 times as Earth
The Moon has about 1/100 the mass of Earth and about 1/4 the radius. What is the surface
gravity of the Moon compared to earth? - correct answer-16/100
The moon has only about 16% of the gravity of Earth. - correct answer-:)
Jupiter has about 300 times the mass of Earth and 10 times the radius. What is the surface
gravity of Jupiter compared to Earth? - correct answer-Three
Despite being over 300 times as massive as Earth, Jupiter has only three times the surface
gravity. - correct answer-:)
Saturn has about 100 times the mass of Earth and 10 times the radius. What is the surface
gravity of Saturn compared to Earth? - correct answer-1
According to Newton's Second Law of Motion, if the next 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 you toward the
Earth. Which of the following is true according to Newton's 3rd Law? - correct answer-You
are pulling the Earth away from yourself with the same force.
What would happen to 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.
When the northern hemisphere is tilted TOWARDS the Sun, the 'Average Daily Temperature'
is marked as ___ suggesting that the northern hemisphere is experiencing ___ - correct
answer-Warm, summer
, And, on the opposite site of the orbit, when the northern hemisphere is tilted the farthest
AWAY from the sun, the average daily temperature is marked as ____, suggesting that the
northern hemisphere is experiencing ___. - correct answer-Cold, winter
in the southern hemisphere it's ___, in late June, - correct answer-Winter
in the southern hemisphere it's ____ is in late December. - correct answer-Summer
The southern hemisphere has opposite seasons than the northern hemisphere because of
Earth's tilt. - correct answer-:)
Hey, these two dates are on opposite sides of the Earth's orbit near - correct answer-March
21 and September 21 (Vernal and Autumnal Equinox or the first day of spring and fall).
Longest day of the year in the northern hemisphere is on or about ___ and the shortest is,
again, six months later near ___, when the Earth is at the opposite point in its orbit around
the Sun. - correct answer-June, December
there aren't really any seasons on Venus; the temperature is 'mild' all the time. - correct
answer-:)
Near the polar regions, there's no sun at the same parts of the year. That might mean -
correct answer-the seasons on Uranus are extreme.
Uranus doesn't really have a surface.
Uranus is so far away from the Sun, it's basically cold all the time. - correct answer-:)
Uranus is tilted 86 degrees. It's like that planet's knocked over sideways! The sunlight angle
goes from straight up and down to no Sun at all at some part of the year. - correct answer-It
looks like the seasons are really extreme there, from "hot" to "cold."
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 the 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 now
A new planet orbits its star faster than the Earth orbits the Sun and it rotates more slowly
than 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 of Earth? - correct
answer-June
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