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The classical picture of the hydrogen atom has a single electron in orbit a distance 0.0529nm from the proton. Calculate the electric potential associated with the proton's electric field at this distance.
If an average frequency emitted by a 200,-,rm W light bulb is 5.00 times 10^{14} , {rm Hz}, and 10.0 percent of the input power is emitted as visible light, approximately how many visible-light photons are emitted per second .
An osprey’s call is a distinct whistle at 2200 {rm Hz}. An osprey calls while diving at you, to drive you away from her nest. You hear the call at 2300 {rm Hz}. Explain how fast is the osprey approaching?
A thin, uniform rod is hinged at its midpoint. To begin with, one half of the rod is bent upward and is perpendicular to the other half. What is the angular velocity of the straight rod
A string is wound around a metal wheel that is free to spin on a frictionless pivot. A hanging mass is connected to the other end of the string. What is the initial velocity of the hanging mass
What is the horizontal component of superhero's displacement.
A nuclear power plant generates 3000 MW of energy from nuclear reactions in reactor%u2019s core. What is the maximum thermal efficiency of the power plant
You have a cup containing 220 g of freshly brewed coffee which, at 75C, is too warm to drink. estimate how much the entropy of the universe increases
You bring a 350 wrench into the house from your car. The house is 17 degree Celsius warmer than the car, Find the heat capacity of the wrench
A Carnot engine has an efficiency of 0.325, and the temperature of its cold reservoir is 414 K. what amount of heat is put into the engine
A spherical mirror is polished on both sides. When the convex side is used as a mirror, the magnification is +1/4. What is the magnification when the concave side is used as the mirror, the object remaining the same distance from the mirror.
A crate of mass 12.5 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline, How much mechanical energy is lost due to friction
Consider a 7 solar mass main sequence star, Estimate its luminosity in solar luminosities and how long (in years) it could maintain its luminosity through gravitational collapse
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