What color of stars are found in the young star clusters in the disk of the Whirlpool galaxy?
A) Infrared.
B) White.
C) Red.
D) Blue.
E) Ultraviolet.
Ans: D) Blue.
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Two identical resistors are connected in series across the terminals of a battery with a voltage V and a current i flows through the circuit. If one of the resistors is removed from the circuit and the remaining one connected across the terminals of the battery, how much current would flow through the circuit?
a) 4i b) 2i c) i d) i/2
Charge of uniform linear density 3.0 nC/m is distributed along the x axis from x = 0 to x = 3 m. Which of the following integrals is correct for the electric potential (relative to zero at infinity) at the point x = +4 m on the x axis?
A.
B.
C.
D.
E.
Why use nuclear power on a satellite?
a. It can supply energy for many years on long space missions. b. Solar cells don't work well in the outer solar system far from the Sun. c. Sending radioactive materials into space is a good way to get rid of them so they don't create a hazard on Earth. d. all of the above
The lunar highlands are composed primarily of ________.
A. olivine B. anorthosite C. silicon dioxide D. basalt