RMS and Peak Quantities: The peak current and voltage outputs of a generator are 20 A and 240 V, respectively. What average power is provided by the generator?
Fill in the blank(s) with the appropriate word(s).
2.4 kW
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In the asteroid impact theory of the extinction of the dinosaurs some 65 million years ago, the dinosaurs (and over half of all the other species on Earth at that time) died off largely because
A) of injuries suffered from direct hits of pieces of the asteroid or comet. B) dust injected into the stratosphere from the impact absorbed visible light from the Sun, causing global temperatures to plummet. C) radiation from iridium in the asteroid caused the dinosaurs to die of cancer. D) the impact caused massive earthquakes and volcanic activity worldwide. E) dust settled on the leaves of plants, making them inedible, so the animals died of starvation.
A strobe photograph of a car moving along a straight road shows the interval between each successive image to be diminishing. If the direction of motion of the car is taken as positive, which of the following are negative?
a. the speed of the car c. the average acceleration of the car b. the average velocity of the car d. all of the above
Suppose that several projectiles are fired upward. Which one will be in the air longest? (R is range, h is highest elevation, and t is time of flight.)
A) The one with the farthest range, R B) The one with the highest maximum elevation, h C) The one for which the product of (R)(t)(h) is maximum D) The one with the greatest initial velocity E) The one with the minimum elevation, h
Pluto's gravity affects the orbit of Uranus, and this fact was used to discover Pluto
Indicate whether the statement is true or false