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A stellar black hole may form when a massive star dies. The star collapses down to a single point. Our Sun will not become a black hole because it does not have enough mass, so let us imagine a black hole with eight times the mass of the Sun. A single point has no radius, but a black hole has an effective radius known as the Schwarzscfhild radius. If an object gets inside the Schwarzscfhild radius, it never escapes. The Schwarzscfhild radius of an eight solar-mass black hole is about 24 km.
a. Find the escape speed using the Schwarzscfhild radius.
b. Compare your answer to the speed of light and speculate on how these objects got the name ''black hole.''
Calculate the fundamental frequency of a 4 meter organ pipe that is open at both ends. Assume that the temperature is 20oC and the speed of the sound is 344 m/s.
A 9.0 kilogram cylinder rolls without slipping on a rough surface. At an instant when its center of gravity has a speed of 11.0 m/s. Find the rotational kinetic energy about its center of gravity
Conservation of energy tells us that energy cannot be created or destroyed. Clearly, energy is required for radioactivity to occur. How could the age of this fragment be determined
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q1. consider a too-small space station that consists of a 3.1 m radius rotating sphere. a man standing inside is 2.0 m
A scaffold of mass 57 kg and length 6.5 m is supported in a horizontal position by a vertical cable at each end. What is the tension in the cable closer to the painter
Two large blocks are momentarily placed in contact. Block A has temperature 567 K and transfers 849 J of heat energy to block B, which has temperature 288 K. The temperatures of the blocks are unchanged. What is the change in entropy of the system co..
Two long, parallel wires are attracted to each other by a force per unit length of 320 ?N/m when they are separated by a vertical distance of 0.500 m
What is the magnitude of the net force on the student.What is the magnitude of contact force on the student by the backpack.
a rifle with a weight of 30 n fires a 5.0g bullet with a speed of 300ms. if a 700 n man holds the rifle firmly against
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