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Astro 7N Exam 1 Exam Latest Update Questions and Correct Answers Rated A+
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 acceleration -ANSWER-acceleration increases
If the earth were moves to half its current distance from the Sun, how would the force of gravity by the Sun on the Earth change -ANSWER- it would become four times weaker
What did newton's law of universal gravitation tell us about how gravity works -ANSWER-the force of gravity from the sun will be stronger on object with more mass
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 third law -ANSWER-you are pushing the earth away from yourself with the same force
What would happen to the earth sun's gravity somehow turned off instantaneously -ANSWER-it would continue to move in the line in the same direction it was moving when the gravity turned off
Newton's Universal Law of Gravitation -ANSWER-This law gives the force of gravity between any two objects in the Universe. The force of gravity is proportional to (mass of object 1) × (mass of object 2)
divided by the distance between the two objects squared:
F M1 x M2 / d 2
Again, more mass = stronger gravity. If the objects were moved 2 times closer (or, to half of their initial distance between), ...F M1 x M2 / (1/2) 2 = M1 x M2 / (1/4) = 4 (M1 x M2) ... So, the gravitational attraction would become 4 times as great.
The Seasons, Day & Night -ANSWER-Q: What causes day and night?
A: Rotation of the Earth on its axis.
Q: How does the Sun appear to move in the sky in the course of a
day?
A: East to West, because of Earth's rotation. The stars and planets
move in the same Way from our point of view, also, because of Earth's rotation.
Q: What happens to the Earth in one year?
A: It orbits the Sun, once (also referred to as one complete revolution
about the Sun).
Q: Why do we have seasons?
A: The tilt of the Earth's axis of rotation, with respect to the plane of its
orbit around The Sun (and not because of changing distance from Sun).The Earth's tilt is about 23 degrees.
Q: How is the Earth's axis tilted when we have summer in the
Northern hemisphere?
A: With the North pole toward the Sun.
Q: What season is it in the Southern hemisphere when it is summer in
the Northern hemisphere?
A: Winter
The Seasons, Day & Night pt2 – Winter begins on or about Dec. 21 = in the Northern hemisphere, the nights are longer than days
Spring begins on or about March 21 = days and nights have equal length
Summer begins on or about June 21 = days longer than nights in the North
Fall begins on or about Sept. 21 = days and nights have equal length
Seasons would not happen if the Earth's axis were not tilted. The distance between the Earth and the Sun does not change very much over the course of a year, so the temperature does not change much for that reason. Without the tilt of Earth's axis there would be no seasons on Earth. Mars has a similar tilt to its rotation axis as Earth does.
If earth rotated on it axis more slowly than it does now; -ANSWER- days would be longer
If earth had its orbit changed so that all points along its orbit it were always the same distance from the sun (circular orbit), how would this affect the seasons on earth? -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 he earth rotates. Which is true -ANSWER-the new planet has a shorter year than earth and a longer day than earth
What time of year is it dark all (and night) at the south pole of earth? - ANSWER-June
When the northern hemisphere is tilted TOWARDS the Sun the average daily temperature is marked as____, suggested that the northern hemisphere is experiencing____ -ANSWER-warm; summer
And, on the opposite site of the orbit, when the northern hemisphere is tilted the farther away from the sun, the average daily temperature is marked as____, suggesting that the norther hemisphere is experiencing___ -ANSWER- cool; winter
In the southern hemisphere its ___in late June, and __is in late December -ANSWER-winter ;summer
The 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 -ANSWER- June 21 and December 21
These are called summer solstice and winter solstice
Two dates are on opposite sides of the earth's orbit near -ANSWER- March 21 and September 21
These are called the Vernal Equinox and Autumnal equinox (equal night)
Moon Phases and Eclipses
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