The net work done in accelerating a propeller from rest to an angular velocity of 200 rad/s is 3000 J. What is the rotational inertia of the propeller?
What will be an ideal response?
0.15 kg?m2
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A certain amount of a monatomic gas is maintained at constant volume as it is cooled by 50 K. This feat is accomplished by removing 400 J of energy from the gas. How much work is done by the gas?
A) zero B) 200 J C) 400 J D) -400 J E) none of the above
The larger the ripple voltage, the better the filter.
a. True b. False
The ancient Greeks get a lot of attention for their contributions to science because
A) they were the first people known to try to explain nature with models based on reason and mathematics, without resort to the supernatural. B) the books of every other culture were lost in the destruction of the library of Alexandria. C) they were the first people to realize that Earth is a planet orbiting the Sun. D) they were the only ancient culture that kept written records of their astronomical observations.
The ____ is (are) the hot gases that are the moving extension of the sun's corona
a. spicules b. prominences c. flares d. supergranules e. solar wind