If the distance to the moon were halved, then the force of attraction between the earth and moon would be
A. quartered.
B. halved.
C. doubled.
D. quadrupled.
D. quadrupled, since the force is inversely proportional to the square of the distance.
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Wave Characteristics: An electromagnetic wave is propagating towards the west in free space. At a certain moment the direction of the magnetic field vector associated with this wave points vertically upward. What is the direction of the electric field vector?
A. horizontal and pointing south B. vertical and pointing down C. horizontal and pointing north D. vertical and pointing upward E. horizontal and pointing east
Spheres of Charge: A spherical conductor of radius 2.0 mm carries a charge of 7.1 nC. What is the magnitude of the electrical field at 6.0 mm from the center of the sphere? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 25 × 106 N/C B. 89 × 106 N/C C. 1.8 × 106 N/C D. 780 × 106 N/C E. 0.89 × 106 N/C
The attraction of Earth on a skydiver pulls the diver downward. The reaction to this force is
A) air resistance the skydiver encounters while falling. B) Earth pulling upward on the skydiver. C) the attraction to the planets, stars, and every particle in the universe. D) all of the above E) none of the above
A 1.0-kg aluminum ingot is heated from 0°C to 100°C. By what amount does its mass change? The specific heat of aluminum is 900 J/kg ? K. (c = 3.0 × 108 m/s)
A) Its mass does not change. B) Its mass increases by 0.50 × 10-12 kg C) Its mass decreases by 0.50 × 10-12 kg D) Its mass increases by 1.0 × 10-12 kg E) Its mass decreases by 1.0 × 10-12 kg