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Each form of energy generation in stars depends on temperature.
A. The rate of hydrogen fusion (proton-proton chain) near 10^7 K increases with temperature as T^5. If you raise the temperature of the hydrogen-burning core by 10 percent, how much does the hydrogen fusion energy increase?
B. Helium fusion (the triple-alpha process) at 10^8 K increases with an increase in temperature at a rate of T^38. If you raise the temperature of the helium-burning core by 10 percent, how much does the helium fusion energy increase?
compute the force exerted by the man, the work done by the man on the piano, the work done by the friction force, the work done by the force of gravity, and the net work done on the piano.
What is the maximum speed with which a 1060kg car can round a turn of radius 75m on a flat road if the coefficient of static friction between tires and road is 0.80.
The loaded cab of an elevator has a mass of 3.00 multiplied by 103 kg and moves 171 m up the shaft in 23s at constant speed. At what average speed does the force from the cable do work on the cab?
Calculate charges, current, potential difference.
Determine how long it would take an astronaut to fall from a height of 2 meters on the Moon. Compare this time to the time it would take the astronaut to fall the same 2 meters on the Earth. Also, compare the time to the time it would take on the ..
One hundred k mol of a gas containing 94.4 mole% methane, 3.40% ethane, 0.60% propane, and 0.50 percent butane is to be burned with 17% excess air. Calculate the required molar flow rate of the air.
If astronauts could travel at v = 0.950 c, we on Earth would say it takes (4.20 / 0.970) = 4.42 years to reach Alpha Centauri, 4.20 light-years away. The astronauts disagree. How much time passes on astronauts' clocks? What is the distance to Alph..
A certain telescope has an objective of focal length 1580cm. If the Moon is used as an object, a 1.4 cm long image formed by objective corresponds to what distance, in miles, on the Moon? Suppose 3.8 multiplied by 108 m for the Earth-Moon distance..
compute the total energy radiated by the Sun each second.
Old naval ships fired 14 kg cannon balls from a 250 kg cannon. It was very important to stop the recoil of the cannon, since otherwise heavy cannon would go careening across the deck of the ship. In one design, a large spring with spring constant 2..
A source produces sound waves of time period .001 second and wave length of 20 cm. find the time taken by sound waves to travel a distance of 800 metres.
A 500 g block slides along a frictionless surface at a speed of 0.35m/s .it runs into a horizontal mass less spring with spring constant 50N/m that extends outward from a wall.
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