S1 W3 Astronomy FC - Vectors, Laws of motion, Sig Figs
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19 questions
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Kepler's laws and milankovitch cycles
Kepler's laws and milankovitch cycles
Question 1
1.
Review from last week: Consider a comet, with a far more eccentric orbit than a planet like earth. Can you explain in terms of Kepler's law why the comet must move much slower when it is at the outer edge of the solar system than when it is close to the earth?
Question 2
2.
Question 3
3.
Question 4
4.
Question 5
5.
Question 6
6.
Question 7
7.
Question 8
8.
Step 1: read chapter 2.1-2.4 in your book.
Note any questions you have here.
Question 9
9.
Question 10
10.
Question 11
11.
Question 12
12.
Question 13
13.
Consider a comet, with a far more eccentric orbit than a planet like earth.
You already explained above why Kepler's law says it moves faster close to the sun and slower away from the sun. Can you explain in terms of Newton's law of universal gravitation why the comet must move much slower when it is at the outer edge of the solar system than when it is close to the sun?
Question 14
14.
Explain newton's third law in your own words.
Question 15
15.
Question 16
16.
You are floating in space again, throwing a ball. what happens to you when you throw the ball? how would that change if the ball is significantly heavier (assume you throw both balls at the same speed?)
Question 17
17.
Your measurements for your parallax lab asked you to calculate to the nearest tenth of a degree. how many significant figures would that be?
Question 18
18.
0.0003400 has four significant figures. Can you explain why two of the zeros counted as sig figs, and four of them did not?
Question 19
19.
The center of the sun is always where in a planet's orbit?
on a focus of the ellipse
on the end of the semi-major axis
on the end of the semi-minor axis
The sun moves about in the ellipse.
There are several ways to write vectors. which of the following will not work for this vector
<4,3>
4i +3j
velocity is 5 mph 36.9° north of east
v=5
A vector requires
starting point, units, magnitude and direction
units magnitude and direction
magnitude and direction
direction
One of the main differences between the speed and the velocity is that speed is a scalar (magnitude, no direction) and velocity is a vector (magnitude and direction). So if a car is moving at a constant miles/hour but is traveling on this road
you would say that car has
constant speed but changing velocity
constant speed and constant velocity
changing speed but constant velocity
changing speed and changing velocity
A car moving north with constant speed has
0 velocity
constant velocity
constant displacement
constantly changing acceleration
A planet moving in a circular orbit at constant speed as
0 velocity
constant velocity
constant displacement
constantly changing velocity
Which of the following is newtons first law of motion
Energy can neither be created or destroyed
an object in motion stays in motion until acted on by an unbalanced force
Entropy is always increasing
force= mass x acceleration
you can never achieve absolute 0
For every action there is an equal and opposite reaction
So if I am floating in space and I throw a ball what will happen
The ball will leave my hand and eventually slow down as it loses energy
the ball will leave my hand and only slow down if it encounters something that acts on it
the ball will leave my hand and continue to accelerate due to the force of the throw
Newton's second law is Force = Mass x acceleration. What is acceleration?
a scalar showing change in speed
a vector showing change in change in speed
a scalar showing change in velocity
a vector showing change in velocity
the force of gravity close to a large star is going to be
stronger than the force farther away
weaker than the force farther away
A cinder block can be weightless in space. Does this mean it does not have mass?