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A hydrogen atom, initially at rest, has its electron in then = 4 state. The electron then makes a transition to the ground state, and the atom emits a photon in the process. What is the recoil speed of the hydrogen atom?
A very small charged block with a mass of 2.35 g is placed on an insulated, frictionless plane inclined at an angle of 17.0° with respect to the horizontal, find the sign and magnitude of the charge on the block
Sam, whose mass is 71.0kg , takes off down a 45.0m high, 8.00? slope on his jet-powered skis. What is the coefficient of kinetic friction of his skis on snow
a block is at rest on an incline of 37 degrees. the coefficients are μs=.81 and μk=.69, resepectively. what is the largest angle which the incline can have
at an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. people sit in
A plane sinusoidal electromagnetic wave in air has a wavelength of 3.90cm and an E field amplitude of 1.40V/m. What is the magnetic field amplitude?
A projectile of mass 0.868 kg is shot straight up with an initialspeed of 28.6 m/s. (a) How high would it go ifthere were no air resistance? (b) If theprojectile rises to a maximum height of only 7.53 m, determine themagnitude of the average force du..
What is the launch speed of a projectile that rises vertically above the Earth to an altitude equal to 14 before coming to rest momentarily? answer in m/s.
You have a thin metal sphere of unknown volume that contains helium gas at low pressure. Given that the volume of the metal sphere, pressure gauge, etc., was 341 mL, how many moles of helium gas would you have
A student standing on the ground throws a ball straight up. How long is the ball in the air before it hits the ground
A cannonball is fired from a gun and lands 740 meters away at atime 20 seconds. What is the x-component and y-component of the initialvelocity? The maximum height of the cannonball?
The label on a 12.0-V truck battery states that it is rated at 150.0 A·h (ampere-hours). Treat the battery as ideal. How much electric energy can the battery supply
A 40 g block of ice is cooled to -75°C and is then added to 590 g of water in an 80 g copper calorimeter at a temperature of 23°C. Decide the final temperature of the system consisting of the water, ice, and calorimeter. Remember that the ice should ..
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