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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?
Suppose a 0.3 kg mass on a spring tha has been compressed 0.10m has elastic potential energy of 1 J. What is the spring constant? Also, how much further must the spring be compressed to triple the elastic potential energy
A pilot claims to have seen a UFO moving initially at a speed of about 373 m/s in an easterly direction and then, Compute the UFO's average acceleration during the turn
An oversized yo-yo is made from two identical solid disks each of mass M = 2.00 kg and radius R = 10.0 cm. what torque does gravity exert on the system with respect to the given axis
A rechargeable battery that is completey drained of electrical energy can be completed charged by applying 2 mA of current for 1.0 hour. how much energy is the battery capable of storing
q1. during an all-night cram session a student heats up a one-half liter 0.50 x 103 m3 glass pyrex beaker of cold
What inductor connected in series with a 200 Ohm resistor and a 20 pF capacitor will give a resonance frequency of 1000 Hz
A concave makeup mirror is designed so the virtual image it produces is three times the size of the object, What is the radius of curvature of the mirror
A 415.00kg elevator accelerates upward at 5.00m/s2 , pulled by a cable of negligible mass. Find the tension force in the cable
Two objects attract each other with a gravitational force of magnitude 0.91 x 10-8 Newton when separated by 19.3 centimeter. evaluate what is the mass of each object
In a Compton scattering experiment, the scattered electron is observed to move in the same direction, what is the scattering angle of the photon
A rectangle coil of 55 turns, dimensions of 0.100m by 0.200m and a total resistance of 10.0 ohms rotates with angular speed 33.0 rad/s about the y axis in a region, Calculate the maximum induced emf in the coil
A person rides a motorbike 190 m along a road that slants upward at 9.0 o from the horizontal. How far has the rider gone in the horizontal direction? How much higher will the rider be at the end of the trip?
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