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In the old days, people thought that the Sun might be a burning briquette of coal. At the Earth, the intensity of the radiation of the Sun is about 1400 W/m2. Assume that the intensity is constant with time. The mass of the Sun is 2.0×1030 kg, and its distance from the Earth is 1.5×1011 m. The heat energy contained in coal is approximately 25 MJ/kg. How long would the Sun shine, if it really were a piece of burning coal?
A person is riding a bicycle, and its wheels have an angular velocity of 13.9 rad/s. What is the anguar acceleration (in rad/s2) of each wheel
A satellite of mass 2 250 kg is initially placed in an orbit about the Earth such that its period is 8.00 h. What was the original radius of orbit of the satellite
Find out the coefficient of sliding friction
A particular organ pipe can resonate at 213 Hz, 355 Hz, and 497 Hz, but not at any other frequencies in between. What is the fundamental frequency of pipe.
Average Rate of Work The loaded cab of an elevator has a mass of 3.00 multiplied by 103 kg and moves 235 m up the shaft in 23s at constant speed. At what average rate does the force from the cable do work on cab.
In living tissue, about one out of every 10-12 carbon atoms are the 14C isotope. how long ago did the owner of the bone die
A Submarine dives to a depth of 312 feet in the ocean, What is the fource (in pounds) acting on a hatch that has an area of 4.7 square feet
Two wires are identical, except that one is aluminium and one is gold. The aluminium wire has a resistance of 0.18. What is resistance of the gold wire.
A very fast-moving train car passes you, moving to the right at 0.50c. You measure its length to be 14m. How long does David measure the train car to be
In an experiment in physics class, a model solid-fueled rocket is fired vertically with an acceleration of 3 m/sec2 for 6 seconds. After that time, What is the maximum altitude the rocket reaches
One point-like charge of -20 nC is placed 3 cm away from a very large planar sheet of charge. Find the locations where the electric field is zero
A wooden board that is 50 cm long, 20 cm long, and 4 cm thick is floating in water. Rocks are then carefully placed on the top face of the board until the top of the wood just slips below the water surface. The density of water is 1000 kg/m^3 and ..
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