Suppose at the surface of the Earth a person can do 20 pushups. In a spaceship far away from any gravitational influence, accelerating at g, the same person could do
A) less than 20 pushups.
B) 20 pushups.
C) more than 20 pushups.
Answer: B
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Power: Jill does twice as much work as Jack does and in half the time. Jill's power output is
A. the same as Jack's power output. B. one-fourth as much as Jack's power output. C. one-half as much as Jack's power output. D. twice Jack's power output. E. four times Jack's power output.
A spaceship visits a star that is 4.5 light-years from Earth, and the spaceship travels at one-half the speed of light for the entire trip
(a) How long did the trip take according to an observer on Earth? (b) How long did the trip take according to an observer on the spaceship?
The fresh newly created surfaces of icy satellites of Jovian planets
a. appear dark in color with few impact craters. b. appear dark in color with many impact craters. c. appear very bright because fresh ice is very reflective. d. generally show long bright grooves and a modest number of impact craters. e. generally have small volcanoes that are active.
Coulomb's Law: A point charge Q1 = +6.0 nC is at the point (0.30 m, 0.00 m); a charge Q2 = -1.0 nC is at (0.00 m, 0.10 m), and a charge Q3 = +5.0 nC is at (0.00 m, 0.00 m). What are the magnitude and direction of the net force on the +5.0-nC charge due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
What will be an ideal response?