If you were to come back to our Solar System in 8 billion years, what might you expect to find?
A) a red giant star
B) a white dwarf
C) a rapidly spinning pulsar
D) a black hole
E) Everything will be pretty much the same as it is now.
B) a white dwarf
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Patches of cooler material on the Sun's surface are called
a. flares. b. prominences. c. cool spots. d. sunspots.
Where do the names for the moons of Mars (Phobos and Deimos) come from?
A) the founders of Rome B) the twins depicted in the constellation Gemini C) the names of their discoverers D) the sons of Ares and Aphrodite E) the names of the dogs of Orion
If a sound level increases by 20 dB, the intensity increases by a factor of _______.
a. one thousand b. one hundred c. ten d. ten thousand
A 15-turn rectangular loop of wire of width 10 cm and length 20 cm has a current of 2.5 A flowing through it
Two sides of the loop are oriented parallel to a uniform magnetic field of strength 0.037 T, and the other two sides are perpendicular to the magnetic field. (a) What is the magnitude of the magnetic moment of the loop? (b) What torque does the magnetic field exert on the loop? What will be an ideal response?