Simple Harmonic Motion: The figure shows a graph of the position x as a function of time t for a system undergoing simple harmonic motion. Which one of the following graphs represents the velocity of this system as a function of time?
A. graph a
B. graph b
C. graph c
D. graph d
Answer: B
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Sunspots are dark splotches on the Sun. Which statement is true?
A) They are hotter than the surrounding areas of the Sun. B) They are extremely cold objects, as cold as Pluto. C) They are extremely hot, but cooler than the surrounding areas of the Sun. D) They are solid bodies floating on the surface of the Sun. E) They are associated with areas of very low magnetic fields.
Why are planetary magnetic fields important?
A. They protect the planet from impacts. B. They help prevent the loss of a planet's atmosphere. C. They counteract tidal forces. D. They keep the planet rotating.
A diverging lens produces an image of a real object. This image is
a. reduced, upright, and virtual. b. enlarged, inverted, and real. c. reduced, inverted, and virtual. d. enlarged, upright, and real. e. enlarged, upright, and virtual.
Energy and Mass: One of the first atomic explosion released approximately 1.0 × 1014 J of energy. How much matter had to be changed into energy to produce this yield? (c = 3.0 × 108 m/s)
A. 1.1 g B. 23 g C. 13 g D. 0.45 kg E. 1.1 kg