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A hydrogen atom initially in the n=3 level emits a proton and ends up in the ground state.
a) What is the energy of the emitted photon?
b) If this atom then absorbs a 2nd photon and returns to the n=3 state, what must the energy of this photon be?
A 8.90 kg object oscillates at the end of a vertical spring that has a spring constant of 1.95 multiply.gif 104 N/m. Calculate the frequency of the dampened oscillation
At a dock, a crane lifts a 1200 kg container 30 m, swings it out over the deck of a frieghter, How much work is done by the crane on the container
A fully equipped astronaut has a mass of 140 kg. If the astronaut has a weight of 675 N standing on the surface of a planet, what is the acceleration due to gravity on this planet?
Some amusement park rides move you back and forth in the horizontal direction. Why is this motion so much more disturbing to your body than cruising at a high speed in a jet airplane.
two point charges are located on the y axis as follows: charge q1 = -1.50nC at y1 = -0.550m , and charge q2 = 4.10nC at the origin, What is the magnitude of the net force
The helicopter view in the figure below shows two people pulling on a stubborn mule. What is the single equivalent force magnitude and direction
What is the temperature T of the Concorde's skin in flight?
A 581-{\rm N} physics student stands on a bathroom scale in an 821-{\rm kg} (including the student) elevator that is supported by a cable. Find the magnitude of the acceleration of the elevator
Two 1.6V. batteries are connected together in series to a bulb whose resistance is 60 ohms. How many electrons leave each battery per minute
A uniform density cube of mass m, side 2b, and center at C is placed on a fixed horizontal cylinder of radius r and center O in Earth's gravitational field. The cube is originally put so that C is centered above O, but it can roll from side to side w..
The helium-neon lasers most commonly used in student physics laboratories have average power outputs of 0.250 mW. Find the peak magnetic field strength
A current of -3.70 A is located 5.51 cm along the x axis, that is, at the point (5.51,0.00) cm. A current of -6.15 A is located 4.08 cm along the y axis, Find the magnetic field at the origin
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