Which of the following is a technique used by astronomers in their search for other planetary systems?
a. Observation of the star's rotation only
b. Observation of the Doppler shifts in the star's spectrum only
c. Both (A) and (B)
d. The search for alien signals
c
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Typically, what color is the Martian sky during the daytime?
A) green B) yellow-brown C) red D) blue
Your bat hits the ball pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude is
A) somewhat less than 1500 N. B) somewhat greater than 1500 N. C) exactly equal to 1500 N. D) essentially zero.
A point charge creates the electric field shown. At which of the points would the potential energy of a positive test charge have the largest value?
A. A B. B C. C D. D
A convex mirror will allow you to see large areas normally hidden from your view
Indicate whether the statement is true or false