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The electronic energy level of a certain system are given by En = E1*n2, where n = 1, 2, 3. Assume that transitions can occur between all levels. If one wanted to construct a laser from this system by pumping the n = 1 to n = 3 transition, which energy level or levels would have to be metastable?
A 1432.0 g mass is on a horizontal surface with μk = 0.44, Calculate the distance the spring was compressed. What is the velocity of the mass as it loses contact with the spring
A finch rides on the back of a Galapagos tortoise, which walks at the stately pace of 0.060 m/s. What was the average speed of the finch
The power rating of a 1000-W heater specifies the power consumed when the heater is connected to an ac voltage of 120 V. Explain why the power consumed by two of these heaters connected in series with a voltage of 120 V is not 2000 W.
draw free body diagrams for the following that is all.a a 784.8 n weightlifter is standing holding a bar weighing 981 n
A train traveling at v0 = 28.0 m/s begins to brake by applying a velocity-dependent instantaneous acceleration a(v) = ? /(v+u) m/s^2, Determine the distance traveled by the train until it comes to a complete stop
A charged particle of mass 0.0020 kg is subjected to a 6.0 T magnetic field which acts at a right angle to its motion. what is the magnitude of the charge on the particle
An 11.0-W energy-efficient fluorescent light bulb is designed to produce the same illumination as a conventional 40.0-W incandescent light bulb. How much money does the user of the energy-efficient bulb save
Four point charges, each having a charge with a magnitude of 2.00 uC, are at the corners of a square whose sides are 4.00 m long. Find the electrostatic potential energy of this system
A crate rests on the flatbed of a truck that is initially traveling at 15 m/s on a level road. what is the minimum coefficient of friction between the crate and the truck that is required to keep the crate from sliding
A person going for a morning jog on the deck of a cruise ship is running toward the bow of the ship at 2.2 m/s while the ship is moving ahead at 7.5 m/s. What is the jogger's velocity relative to the water now
Planets are not uniform inside. Normally, they are densest at the center and have decreasing density outward toward the surface. What is the acceleration due to gravity at the surface of this planet
A electric model train travels at 34.7 cm/s around a circular track of radius 1.61 m. Find the train's period of revolution
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