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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?
An object with a charge of 0.920 µC is placed at the center of a regular tetrahedron with 4 equivalent surfaces. What is the electric flux through one surface of the tetrahedron?
A swimmer heads directly across a river, swimming at 1.9 m/s relative to the water. She arrives at a point 34 m downstream from point directly across the river, which is 80 m wide.
What is the angular frequency in rev/s of combination.
An important news announcement is trans- mitted by radio waves to people who are 122 km away, sitting next to their radios, and by sound waves to people sitting across the newsroom, 1.2 m from the newscaster. Take the speed of sound in air to be 345 ..
Thermal energy can shift some of the electrons in a hot semiconductor from valence levels to conduction levels. What effect do these shifts have on the semiconductor's ability to conduct electricity.
A person driving her car at 57km/h approaches an intersection just as the traffic light turns yellow. She knows that yellow light lasts only 2.0 s before turning to red, and she is 30m away from the near side of the intersection.
After the skier on the hill had been moving for 5.0 s, friction of the snow suddenly increasedmaking the net force on the skier zero. what is new coefficient of friction? how fast would the skier now be going after skiing for 5.0s.
What was the bullet's flight time. A marble is thrown horizontally with a speed of 11 m/s from the top of a building. When it strikes the ground, the marble has a speed that makes an angle 38° with the horizontal. From what height above the ground..
A toy train is pushed forward and released at x_0 = 2m with a speed of 2m/s. It rolls at a steady speed for 2s, and then one wheel begins to stick. The train comes to a stop 6m from the point at which it was released. What is the magnitude of trai..
Megan's mass is 28kg. She climbs the 4.8m ladder of a slide and reaches a velocity of 3.2m/s at the bottom of the slide. How much work was done by friction on Megan? Assume that air resistance is negligible.
A high diver of mass 65kg jumps off a board 10m above the water. If her downward motion is stopped 1.70 s after she enters the water, what average force did the water exert on her.
Vector A has a magnitude of 8 units and makes an angle of 45.0° with the positive x-axis. Vector B also has a magnitude of 8.00 units and is directed along the negative x-axis. (Using graphical methods), find (a) vector sum A + B and (b) vector diffe..
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