When a parachutist jumps from an airplane, he eventually reaches a constant speed, called the terminal speed. Once he has reached terminal speed
A) his acceleration is equal to g.
B) the force of air drag on him is equal to zero.
C) the force of air drag on him is equal to g.
D) his speed is equal to g.
E) the force of air drag on him is equal to his weight.
E
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A 200-kg spacecraft is launched to the Moon. While in orbit around the Moon, its weight is ________.
A. zero B. 200 kg C. about 1/6 its weight on Earth D. The answer depends on how close to the Moon the ship is orbiting.
Loops of glowing hydrogen seen hanging over the solar limb during totality are:
A) solar rainbows. B) haloes. C) prominences. D) filaments. E) flares.
A proton is accelerated from rest through 500. V. It enters a magnetic field of 0.300 T oriented perpendicular to its direction of motion. Determine:
(a) the radius of the path it follows. (b) the frequency with which it moves around this path.
The Earth's hotter, inner core is liquid and its cooler, outer core is solid
Indicate whether the statement is true or false