You drop a rock in a pond, and the water waves travel away from the rock with a certain speed. You drop a heavier rock in the water. The speed of the waves in the water from the heavier rock
a. remains unchanged
b. increases
c. decreases
d. cannot be determined
A
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Which of the following statements is true of the dynamo effect?
A) It is related to the degeneration of the Sun's magnetic field at the bottom of the convection zone deep under the photosphere. B) It is believed to trap ionized gases in a magnetic arch that rises up through the photosphere and enters the lower corona. C) It is believed to operate in the liquid metal of Earth's core to produce Earth's magnetic field. D) It is related to the creation of a Doppler shift toward shorter wavelengths caused by a velocity of approach.
A temperature of 0 Kelvin means there is essentially no motion at the atomic level.
Answer the following statement true (T) or false (F)
Space telescopes looking for transiting planets look for small drops in brightness; these drops are:
A) less than 10%. B) less than 1%. C) less than 0.01%. D) less than 0.0001%. E) any size.
A conducting sphere of radius 20.0 cm carries an excess charge of +15.0 µC, and no other charges are present
(k = 1/4??0 = 8.99 × 109 N • m2/C2 ) The potential (relative to infinity) due to this sphere at a point 12.0 cm from its center is closest to A) zero. B) 674 kV. C) 1130 kV. D) 3380 kV. E) 9380 kV.