Consider again the civilization described in the previous question. (They live on a planet orbiting 10 AU from a close binary star system that consists of a 15 MSun red giant star and a 10 MSun black hole surrounded by an accretion disk
) One foolhardy day, a daring individual in their space force (let's call him Major Tom) decides to become the first of his species 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 to start the process of killing him first)?
A) tidal forces due to the black hole
B) the crush of gravity at the singularity embedded within the black hole
C) X-rays from the accretion disk
D) the sucking force from the black hole, which will cause his head to explode
C
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This photograph shows x-ray emission from a supernova remnant. What is the source of the x-rays?
A) hot gas expanding outward from the site of a supernova B) cold gas that will soon give birth to new stars C) accretion disk around a black hole near the center of the supernova remnant D) spots within the remnant where hot gas is crashing into and destroying planets
The resonance frequency of an RLC circuit is the frequency at which the circuit dissipates minimum power
Indicate whether the statement is true or false
A 3.0-kg block slides on a frictionless 20° inclined plane. A force of 16 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?
a. 2.0 m/s2 down the incline b. 5.3 m/s2 up the incline c. 2.0 m/s2 up the incline d. 3.9 m/s2 down the incline e. 3.9 m/s2 up the incline
When an object floats in a liquid, the buoyant force is larger than the weight of the object
Indicate whether the statement is true or false