One foolhardy day, a daring major (let's call him Tom) in the space force decides to become the first of his race to cross the event horizon of the black hole
To add to the drama, he decides to go in wearing only a thin space suit, which offers no shielding against radiation, no cushioning against any forces, and so on. Which of the following is most likely to kill him first (or at least cause significant damage)? (Hint: The key word here is first. Be sure to consider the distances from the black hole at which each of the noted effects is likely to become damaging.) A) the crush of gravity at the singularity embedded within the black hole
B) the tidal forces due to the black hole
C) the strong acceleration as he descends towards the black hole
D) the X-rays from the accretion disk
E) the sucking force from the black hole, which will cause his head to explode
D
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Two lights are 1000 ns apart along a stretch of railway track. In the ground frame, the west light flashes 600 ns before the east light flashes. Could these flashes be simultaneous in the frame of a train moving along the track at a certain speed (that is less than the speed of light)?
A. Yes, if the train is moving east at the correct speed. B. Yes, if the train is moving west at the correct speed. C. Yes, if the train observer happens to be at the right distances from the lights when receiving their flashes. D. No, the flashes cannot be simultaneous in any frame.
One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C; exhaust temperature = 430°C. 7 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
(a) What is the actual efficiency of this engine? (b) What is the Carnot efficiency of this engine?
If an optical system consists only of an object and a single convex mirror,
a. the image will sometimes be inverted. b. the magnification will sometimes have an absolute value greater than 1. c. the image distance will never be negative. d. the image will always be virtual.
The Japanese word tsunami means "______________ wave."
Fill in the blank(s) with correct word