If each frame of a motion picture film is 35 cm high, and 24 frames go by in a second, estimate how many frames are needed to show a two-hour-long movie.
A. 1400
B. 25,000
C. 50,000
D. 170,000
E. This cannot be determined without knowing how many reels were used.
Answer: D
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A microprocessor chip (10 mm *10 mm square) is to be cooled by an impinging circular air jet that is directed on the chip surface by a 5-mm diameter nozzle, placed at a distance of 10 mm. The electrical activity in the microcircuits of the chip render a uniform surface heat flux condition. For safe operation of the microprocessor, the chip- surface temperature should not exceed 90°C. If air at 20°C flows through the nozzle with a velocity of 10 m/s, and the maximum heat dissipated by the chip is 1.25 W, is this jet- impingement cooling system able to maintain the entire chip surface at a safe operating temperature?
GIVEN
FIND
Whether the jet impinging cooling system be able to maintain the entire chip surface to safe operating
temperature.
How are the event horizon and Schwarzschild radius related?
A) The Schwarzschild radius is smaller than the distance from the singularity of a black hole to the event horizon. B) The Schwarzschild radius is equal to the distance from the singularity of a black hole to the event horizon. C) The Schwarzschild radius is greater than the distance from the singularity of a black hole to the event horizon. D) The size of the Schwarzschild radius is unrelated to the distance from the singularity of a black hole to the event horizon. E) The size of the Schwarzschild radius is proportional to the distance from the singularity of a black hole to the event horizon.
There are three types of collapsed, burned-out stars: white dwarfs, neutron stars, and
A) black holes. B) quasars. C) supernova. D) red giants. E) X-ray stars.
If a planet has a radius 20% greater than that of the Earth but has the same mass as the Earth, what is the acceleration due to gravity at its surface?
a. 14 m/s2 c. 8.1 m/s2 b. 12 m/s2 d. 6.8 m/s2