A sound with ten times the amplitude of another sound is judged to be
a. twice as loud c. 10 dB higher in sound level
b. ten times as loud d. 20 dB higher in sound level
D
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Why is thermal escape of atmospheric gas much easier from the Moon than from Earth?
A) The Moon's average surface temperature is lower than Earth's. B) The Moon lacks a global magnetic field, while Earth has one. C) Outgassing on the Moon releases gases with lower masses than does outgassing on Earth. D) The Moon's gravity is so much weaker than Earth's.
Of the elements in your body, the only one not formed in stars is
A) hydrogen. B) calcium. C) carbon. D) iron. E) oxygen.
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?2.3 N/C, Ey = Ez = 0 . If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vz = 20 m/s, vx = vy = 0, what is the distance from the origin to the particle at t = 2.0 s?
a. 60 m b. 54 m c. 69 m d. 78 m e. 3.2 m
A metal blade spins at a constant rate of 5.0 revolutions per second about a pivot through one end of the blade. This rotation occurs in a region where the component of the earth's magnetic field perpendicular to the blade is 30 mT. If the blade is 60 cm in length, what is the magnitude of the potential difference between its ends?
a. 0.24 mV b. 0.20 mV c. 0.17 mV d. 0.27 mV e. 0.34 mV