A small car pushes on a disabled truck, accelerating it slowly forward. Each exerts a force on the other as a result of their contact interaction. Which vehicle exerts the greater force on the other?
A. The car
B. The truck
C. Both forces have the same magnitude.
D. The truck doesn’t exert any force on the car.
E. One needs more information to answer.
C. Both forces have the same magnitude.
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Which of the following is true of poor galaxy clusters?
A) They contain about 1500 to 2500 galaxies. B) They primarily contain elliptical galaxies. C) They are densely crowded toward the center. D) They are irregularly shaped.
As you’ve learned from Part B, hydrogen and helium gas never condense under conditions found in the solar nebula. The remaining three categories of material in the solar nebula are shown again here. Rank these materials from left to right based on the distance from the Sun at which they could condense into a solid in the solar nebula, from farthest to closest.
What will be an ideal response?
Which of the following can be described as the totality of all space, time, matter, and energy?
A) The universe B) Astronomy C) The Milky Way D) The Earth E) The solar system
Two identical stars are located at different distances, one star at 2.0 pc and the other at 6.0 pc. How many times greater is the apparent brightness of the nearer star when compared to the more distant one?
A) 1.7 times B) 3.0 times C) 9.0 times D) 18 times E) 27 times