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A pulse from a ruby laser (lambda = 694.3 nm) has an average power of 80 MW and lasts 4.1 ns.
What is the total energy of the pulse?
How many photons are emitted in this pulse?
The cable lifting an elevator is wrapped around a 1.0-m-diameter cylinder that is turned by the elevator's motor. How long does it take for the elevator to stop
A meterstick (L = 1 m) has a mass of m = 0.121 kg. Initially it hangs from two short strings: one at the 25 cm mark and one at the 75 cm mark. What is the tension in the left string?
Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is 1.65 m from one speaker and 4.95 m from the other. What sort of interference does the person sense.
A constant force, = (1.27, -2.33, 3.93) N, acts on an object of mass 10.3 kg, What is the total work done by this force
In a ballistics test, a 23-g bullet travelling horizontally at 1300 m/s goes through a 40.0 cm-thick 450-kg stationary target and emerges with a speed of 900m/s. The target is free to slide on a smooth horizontal surface.
Imagine two 5.0 g bags of protons, one at the earth's north pole and the other at the south pole. Calculate the gravitational attraction that each bag exerts on the other
who is initially at rest, hops on her back and together they continue down the hill. Illustrate what is their speed at the bottom of the hill if the total vertical drop is 17.0 m? Gayle's mass is 50.0 kg, the sled has a mass of 5.00 kg and her bro..
Explain how the process of "doping" a semi conductor can improve its overall efficiency. Why does "doping" require a clean room infrastructure
A 23kg chimpanzee hangs from the end of a horizontal, broken branch of length L_0 = 1.6m, What is the shear modulus for this branch
An assistant standing on the level ground 150 m downrange from the launch point throws an apple straight up with the minimum initial speed necessary to meet the path of the arrow. Elucidate the initial speed of the apple?
A transformer consisting of two coils wrapped around an iron core is connected to a generator and a resistor, What is the peak emf of the generator?
A 1200-kg car carrying four 88 kg people travels over a "washboard" dirt road with corrugations 4.3 m apart. The car bounces with highest amplitude while its speed is 13 km/h. While the car stops, and people get out, by how much does the car body ..
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