Compared with the buoyant force of the atmosphere on a 1-liter helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-liter solid iron block is
A) considerably less.
B) considerably more.
C) the same.
Answer: C
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Betelgeuse is the bright red star representing the left shoulder of the constellation Orion. All the following statements about Betelgeuse are true. Which one can you infer from its red color?
A) It is moving away from us. B) Its surface is cooler than the surface of the Sun. C) It is much more massive than the Sun. D) It is much brighter than the Sun.
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
A vector 
is added to 
. The resultant vector is in the positive x direction and has a magnitude equal to . What is the magnitude of ?
A. 11
B. 5.1
C. 7.1
D. 8.3
E. 12.2
Which one of the following is the correct representation of the relationship between the speed of a wave (v), frequency of the wave (f), and its wavelength (?)?
A) v = 2? B) v = 2f C) v = ?/f D) v = f? E) v = f/?
A sinusoidal electromagnetic wave in vacuum delivers energy at an average rate of 5.00 µW/m2
What are the amplitudes of the electric and magnetic fields of this wave? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)