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Stephen Hawking has predicted the temperature of a black hole of mass M to be T Uc 3/8pkGM, where k is Boltzmann's constant.
(a) Calculate the temperature of a black hole with the mass of the sun. Discuss the implications of the temperature you calculate.
(b) Find the temperature of a supermassive black hole, which may exist at the center of some galaxies, with a mass 6.0 X 109 times the sun's mass.
a 150lb man stands at the rear of a 250lb boat which is pointed towards the pier. the distance from the man to the pier
a close grip lat pull downs involves the upper body in this exercise the person pulls the weight of the upper body arms
Practical steam engines utilize 450°C steam, which is later exhausted at 250°C. What is the overall efficiency of the two engines
A converging lens of focal length 0.169 meter forms a virtual image of an object. Find the distance between the object and the lens
A wistle (frequency = 594 Hz) is essentially a tube with one end open. If the 500 Hz sound is the 1st harmonic, what is the length of the whistle
Suppose that by stirring 854 g of water you are able to increase its temperature from 19 degrees C to 21 degrees C. Find the increase in the water's entropy
What does the stiffness k of the spring have on the vibration period T? What effect does the mass of the block m have on the vibration period T?
An electronic device dissipating 30 W has a mass of 20g and a specific heat of 850 J/kgoC. The device is lightly used, and it is on for 5 min and then off for several hours, throughout which it cools to the ambient temperature of 25 o C.
Determine what is the optimal speed (no friction required) for a van traveling around a banked curve that has a bank angle of 8.0o and a radius of 35 m
Suppose we measure the terminal voltage of a rechargeable NiCad battery and find it to be 1.28 V when measured by a voltmeter. calculate the internal resistance of the battery
A 1-cm-thick layer of water stands on a horizontal slab of glass. A light ray in the air is incident on the water 59 from the normal. After entering the glass, what is the ray's angle from the normal?
gas in a cylinder moves a piston with area 0.200 m^2 as energy is slowly added to the system. find the displacement of the piston
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