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A population inversion for two energy levels is often explained by assigning a negative Kelvin temperature to the system. What negative temperature would explain a system if the population of the upper energy level exceeds that of the lower level by 9.7% and the energy difference among the two levels is 2.41 eV?
A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 13.0 cm, giving it a charge of -17.0 microC. Find the electric field just inside the paint layer
consider a straight piece of copper wire of length 8 m and diameter 4.5 mm that carries a current i 7 a. there is a
A sample of wood from an archaeological excavation is dated by using a mass spectrometer to measure the fraction of 14C atoms. What is the wood's age
Consider the conical pendulum, a mass on the end of a string, with the other end of the string fixed to the ceiling. what is the speed (in m/s) of the mass as it swings
At a waterpark, sleds with riders are sent along a slippery,horizontal surface by release of a large, compressed spring.The spring with a force constant k= 3700 N/m and negligible mass rests on the frictionless horizontal surface.
Illustrate the health care delivery component's role in providing services, as well as explain how it contributes to or lacks contribution to the overall management of health care resources.
If wind blows at 25 m/s over a house, what is the net force on the roof if its area is 214 m2 and is flat
The position of an object connected to a spring varies with time according to the expression x = (4.4 cm) sin(6.9?t). (a) Find the period of this motion.
You find a used battery and discover that it is no longer strong enough to power your CD player. What is the potential difference
A massless rod of length 1m has a 2.00 kg mass attached to one end and a 3 kg mass attached to the other. The system rotates about a fixed axis perpendicular to the rod that passes through the rod 30.0 cm from the end with the 3kg mass attached. The ..
An archer standing on a 15° slope shoots an arrow 20° above the horizontal, as shown in the figure. How far down the slope does the arrow hit
A crane drops a 1.0 kg steel ball onto a steel plate. The balls speed just before impact is 2.0m/s. what is the bounce back speed right after the impact
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