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1. Why do astronomers infer that the Sun's energy comes from nuclear fusion reactions? How do we know it does not come from chemical burning?
2. Explain how the Sun produces energy by nuclear fusion.
3. When we look at stars in the sky we see a wide range of brightness. Explain the factors that would make one star appear brighter than another.
Two electrons are located at two of the vertices of an equilateral triangle, one at each vertex. What is the net electric field at the third vertex
Aparallel-plate capacitor has square plates of edgelength 1.2 cm and a platespacing of 0.11 mm. If the gap between the plates is filled with mica, what is the capacitance?
Point A is the midpoint of one of the sides of a square. On the side opposite this spot, two in-phase loudspeakers are located at adjacent corners, as in Figure 27.39. Standing at point A you hear a loud sound because of constructive interference amo..
A spaceship heads away from earth at 0.20C. The ship beams 400 nm light towards Earth. Obtain the wavelength of light received by the ship
Two moles of an ideal monoatomic gas undergo a cyclic process starting from state A at a vol. of 1L and a pressure of 2 atm. Find the total work done by the gas in one cycle
A ball is shot from the ground into the air. At a height of 8.6 m, the velocity is observed to be v = (8.1)i + (5.3)j in meters per second (i horizontal, j upward). To what maximum height will the ball rise
an object of unknown mass is initially at rest and dropped from a height h. it reaches the ground with velocity v1. the
A 0.381 H inductor is connected to a capacitor and a 45.5 resistor along with a 69.3 Hertz, 28.3 V generator. Calculate the voltage drop across the resistor at resonance
A 5.5 ohm resistor, a 11.3 ohm resistor and a 11 ohm resistor are connected in series with a 36 V battery. If the resistors are instead connected in parallel across the battery, what is the equivalent resistance
A different Wheatstone bridge has a sensitivity of 2.6 mV/O. What will be the approximate output voltage difference when ?Rx = 50 O? Express the answer in millivolts.
At a coal-burning power plant a steam turbine is operated with a power output of 548 MW. At what rate must heat be supplied to the power plant by burning coal
When viewed in a spherical mirror, the image of a setting sun is a virtual image. What is the radius of curvature of the mirror
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