A proton travels at a speed of 5.0 × 107 m/s through a 1.0-T magnetic field. What is the magnitude of the magnetic force on the proton if the angle between the proton's velocity and the magnetic field vector is 30°? (e = 1.60 × 10-19 C)
A) 2.0 × 10-12 N B) 4.0 × 10-14 N C) 2.0 × 10-14 N D) 4.0 × 10-12 N
D
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When a comet is in the inner solar system, what part of it points most directly away from the Sun?
A) the denser side of its nucleus B) its coma C) jets of gas emerging from its nucleus D) its tail
Clouds inhibit the outflow of terrestrial radiation. This acts to
A) insulate Earth's surface temperature. B) warm Earth's surface temperature at night. C) cool Earth's surface temperature during the day. D) insulate Earth's surface temperature, keeping it warmer at night and cooler in the day.
Holding out your hands sideways helps you keep your balance along a narrow set of stepping-stones because
A. the arms outward balance your weight. B. moving the arms outward puts a counter-torque on the stepping-stones. C. arms inward only add to your weight. D. with arms outward, you've increased your total rotational inertia relative to the pivot point: your feet.
At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10-5 T?
A) 1.0 cm B) 2.0 cm C) 3.0 cm D) 4.0 cm E) 5.0 cm