1- Which of these planets has the largest speed as it orbits the Sun? A) Venus B
ID: 112038 • Letter: 1
Question
1- Which of these planets has the largest speed as it orbits the Sun?
A) Venus
B) Earth
C) Jupiter
D) Neptune
2- Choose the answer that does not describe the semi-major axis of an ellipse.
A) The distance form a focus to the other in an ellipse
B) The average distance from planet to Sun
C) Half of distance across the longest line through the ellipse
D) The distance from the center of the ellipse to an edge pointing through a focus of the ellipse.
3- A planet with a semi-major axis of 4 AU would have a period of ____ years.
A) 4
B) 2.5
C) 64
D) 8
4- Two asteroids orbit each other. The first has a mass that is twice as large as the other. We can compare the forces each would feel when only under the influence of the other. Which statement is true?
A) The asteroids do not attract each other since they are not planets
B) We need to know the actual masses
C) The force the larger asteroid feels is equal to the force felt by the other
D) The force the larger asteroid feels from the other is twice as much
5- An asteroid approaches the Sun and its distance has become half as much as it was under previous observation. Comparing the force of gravity to the previous observations tells us it is now ____
A) 4 times the previous force
B) Half of what it was
C) Twice the previous force
D) Unchanged
6- We can "weigh" or determine the mass of planets or stars by directly using ____
A) Newton’s Second Law
B) The Universal Law of Gravity
C) Kepler’s First Law
D) Newton’s version of Kepler’s Third Law
7- The comet Encke has an orbit in this diagram shown among the orbits of other objects. At which of the labeled points in Encke's orbit does it move fastest?
A) a
B) b
C) c
Kopft Halley Hygeia Ceres esta Pallas Mar Earth Encke JupiterExplanation / Answer
1. A. Venus is the planet which revolves at a faster speed when compared to other planets. This speed is inversely proportional to the distance between the sun and the planet itself.
2.A.The distance form a focus to the other in an ellipse
3. We have p^2= r^3
P= period of planet
R= semi major axis of planet
Now p= r^(3/2)
p= 4^(3/2)
= 8 yrs.
5. Assume previous force is F1, new force F2
Previous distance is d1, new is d2.
F1/d^2
Force will be 4 times the previous force.
6. Universal law of gravity
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