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In the Bohr model of hydrogen, the electron moves in a circular orbit around the nucleus. Determine the angular speed of the electron, in revolutions per second, when it is in
(a) the ground state and
(b) the n = 4 state.
A 65kg person throws a 0.0410 kg snowball forward with a ground speed of 28.0 m/s. A second person, with a mass of 60kg, catches the snowball. Both people are on skates.
A 1.15 m long ramp is inclined at 19 degrees to the horizontal. A solid ball is released from rest at the top of the ramp. Find the ball's speed at the bottom of the ramp
A balloon inflated with helium (density .2 kg/m^3). If the density of air is 1.3 kg/m^3, what is the bouyant force exerted on the balloon
an insulated container is filled with a mix of 400 g of water at 20 C and 60 g of ice at 0 C. assuming negligible heat is exchanged with the container, what is the temperature of the mixture when it reaches thermal equilibrium.
q1. a child is sliding on a sled at 1.6 rm ms to the right. you stop the sled by pushing on it for 0.80 rm s in a
A parallel plate capacitor is constructed with Teflon (dielectric constant 2.1) between the plates. What charge was originally stored
Given a planet's circumference and using the the Universal gravitational constant how do I obtain a planet's mass and then calculate the weight of an astronaut on that planet
Light from an argon laser strikes a diffraction grating that has 5306 lines per centimeter. Determine the wavelength of the laser light
A student sits on a rotating stool holding two 2.9-kg objects. When his arms are extended horizontally, Find the kinetic energy of the student before and after the objects are pulled in
If the current in the solenoid increases uniformly from 0 to 4.1A in 0.70s , what will be the induced emf in the short coil during this time
By how much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest? How much horizontal force would you need to keep it moving?
If the speed of sound is 1100 feet per second and a tuning fork oscillates at 440 cycles per second, what is the wavelength of sound produced.
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