The speed of a 4.0-kg object is given by v = (2t) m/s, where t is in s. At what rate is the resultant force on this object doing work at t = 1 s?
a. 48 W
b. 40 W
c. 32 W
d. 56 W
e. 16 W
e
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Which of the following is a difference between low-mass stars and medium-mass stars?
A) Unlike medium-mass stars, low-mass stars can ignite hydrogen and helium. B) Unlike medium-mass stars, low-mass stars develop an inert helium core surrounded by unprocessed hydrogen. C) Unlike medium-mass stars, low-mass stars are not completely convective. D) Unlike medium-mass stars, low-mass stars cannot become giant stars.
The diameter of a typical star (the Sun) is approximately ____ times larger than the diameter of a typical planet (the Earth)
a. 10 b. 100 c. 1000 d. 10,000 e. 100,000
Fragmenting during meteorite impacts caused the breccias found among the lunar samples
a. True b. False Indicate whether the statement is true or false
When a rocket forces exhaust gases downward, the exhaust gases
A) as the name implies, soon exhaust their influence. B) play no further role in the motion of the rocket. C) exert an upward force on the rocket.