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In a lab here on Earth, ionized hydrogen gas emits brightly at a wavelength of 6563A °.Similar ionized gas in M31 (or the Andromed a galaxy) is observed to emit at a wavelength of roughly 6547A °. What does this tell us about the motion of M31 relative to the Milky Way?
A negative charge orbits a positive charge. The orbit is a perfect circle, What is the period of the orbit of the negative charge
A gas of diatomic molecules is in equilibrium at a temperature of 340 K. Compute the mean angular momentum of the molecules
A hockey puck has a mass of 0.116 kg and is at rest. A hockey player makes a shot, exerting a constant force of 27.5 N on the puck for 0.16 s. With what speed does it head toward the goal
Photons of a certain ultraviolet light have an energy of 6.63 x 10-19 J.
Use the ideal gas as a model to estimate the rms speed of a free electron in a metal at the following temperatures.
It has been argued that the United States' economy is shifting from a manufacturing base to a "knowledge economy". What is a knowledge economy? What changes will be necessary for the shift to a knowledge economy?
A child on a swing of length R= 2 meters is given an initial velocity v=8.9 m/s. Calculate the height from the bottom when the cord just goes slack, and the child leaves the circular path
If the reproduction constant is 1.00021 for a chain reaction in a fission reactor, by what factor does the reaction rate increase in one minute
A device operates in a three process cycle. In process one, the device receives 35kJ of heat and does no work. Determine the COP or efficiency as applicable
A satellite is in a circular orbit around and unknown planet. The satellite has a speed of 1.70 x10^4 m/s, and the radius of the orbit is 5.25 x106m. What is the orbital speed of the second satellite
A heat engine with an efficiency of 20.0% performs 2500 J of work. How much heat is discharged to the lower temperature reservoir
a 0.07 kg bullet traveling at 577 ms hits a 5.6 kg block of wood and stays in the wood. what is the velocity of the
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