What are the seasons like on a planet whose rotation axis is NOT tilted with respect to its orbital plane?
A) shorter than those on Earth.
B) longer than those on Earth.
C) the same as those on Earth.
D) Reversed from those on Earth (winter, fall, summer, spring).
E) there are no seasons.
Ans: E) there are no seasons.
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Equilibrium: Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100-N pull, as shown in the figure. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same. 
Which of the figures below shows a correct free-body diagram of the horizontal forces acting on the lower block, B?
A. 
B. 
C. 
D. 
E. None of these diagrams is correct.
Why do power tools with a plastic case not have a 3-prong plug but metal encased tools have (or should have) 3-prong plugs?
What will be an ideal response?
Two wave pulses with equal positive amplitudes pass each other on a string, one is traveling toward the right and the other toward the left. At the point that they occupy the same region of space at the same time
A) constructive interference occurs. B) destructive interference occurs. C) a standing wave is produced. D) a traveling wave is produced. E) a wave pulse is produced.
What is interstellar reddening?
A) Interstellar dust absorbs more red light than blue light, making stars appear redder than their true color. B) Interstellar dust absorbs more red light than blue light, making stars appear bluer than their true color. C) Interstellar dust absorbs more blue light than red light, making stars appear redder than their true color. D) Interstellar dust absorbs more blue light than red light, making stars appear bluer than their true color. E) The spectral line shift due to a star's motion through the interstellar medium.