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What are the quantum mechanisms behind the emission and absorption of thermal radiation at and below room temperature? If the relevant quantum state transitions are molecular (stretching, flexing and spin changes) how come the thermal spectrum is continuous? What about substances (such as noble gases) which don't form molecules, how do they emit or absorb thermal radiation? Are there a semi-classical mechanism (with the EM field treated classically) and also a deeper explanation using the full apparatus of QFT?
an infinite plane has a surface charge of -5cm2. what is the magnitude of the electric field 3 meters from the plane?
1. suppose that you want to cook a 1 inch 2.5 cm thick steak to medium doneness which is an internal temperature of
an water wave oscillates up and down 5 times each second. the distance between the wave crests is 3m how is the
A disk of radius 25 cm lies in a vertical plane and rotates with a constant angular acceleration of 5.00 rad/sec^2. What is the corresponding tangential speed
Bob (m = 60kg) is wearing a sticky suit. Just as he reaches his desired speed of 6m/s, he reaches the edge of ice (assume the ice is frictionless) and collides with a large crate (m = 250kg). How elastic was the collision
On vacation your 1200 kilogram car pulls a 600 kilogram trailer away from a stoplight with an acceleration of 1.20 m/s2. Find the net force exerted by the car in the trailer
A 22.0uF capacitor is charged to 165uC and then connected across the ends of a 4.80mH inductor. Find the maximum energy stored in the inductor
A flywheel with radius 0.75 m has an initial angular velocity of 30 rad/s. What is the angular acceleration of the flywheel
An object initially at rest experiences an acceleration of1.7m/s2 for 7.0s and then travels at that constantvelocity for another 7.0s. What is the objects average velocityover the 14s interval?
A sports car accelerates with constant acceleration from rest to a speed of 31.57 m/s in 4.127 s. The angular acceleration of the rear wheels is 17.75 s-2. What is the radius of the rear wheels
An electron of mass 9.1x10^-31kg is moving in the x-y plane; its speed is 2.0x10^5m/s and its direction of motion makes an angle of 25 degrees by the x-axis. What are the components of the momentum of the electron?
a circular surface with a radius of 0.061 m is exposed to a uniform external electric field of magnitude 1.32 x 104 nc.
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