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A tungsten light bulb filament has a surface area of 2.6*10-5 m2 and is maintained at a temperature of2.5*103 oC. Calculate the rate of energyradiation from the filament. Assume an emissivity of 0.240 and takethe temperature of the surroundings to be 20.0o C.
In 1995 a research group led by Eric Cornell and Carl Wiemann at the University of Colorado successfully cooled Rubidium atoms to the 20-200 nK temperature range
One of the 61.0cm -long strings of an ordinary guitar is tuned to produce the note B3 (frequency 245 Hz) when vibrating in its fundamental mode. Find the speed of transverse waves on this string
A train pulls away from a station with a constant acceleration of 0.42 m/s2. What is the slowest constant speed at which she can run and catch the train
A speed ramp at an airport is basically a large conveyor belt on which you can stand and be moved along. What is the speed at which the belt of the ramp is moving
A thick-walled copper pipe (inner radius a and outer radius b) is centered on the z-axis and carries a current density of magnitude J(r)=B*r. (The parameter B has units A/m^3). A wire runs parallel to the pipe a distance R=2*b away from the z-axis..
Two steel wires of the same length, one with radius r and the other with radius 3r, are connected together, end to end, and tied to a wall. How far does the point where the two wires meet move
A soap film in air has thickness L = 250 meters. It totally reflects orangle light with 620nm wavelength. What color and wavelength of light does it totally transmit
A rock is thrown vertically upward with a speed of 14.0m/s from the roof of a building that is 50.0 m above the ground. Assume free fall. In how many seconds after being thrown does the rock strike the ground? What is the speed of the rock just befor..
In the absence of air resistance, a projectile is launched from and returns to ground level. It follows a trajectory similar to that , What is the new range
An air-filled parallel-plate capacitor has plates of area 5.00 cm2 separated by 1.20 mm. What is the magnitude of the uniform electric field between the plates
A parallel plate capacitor has a potential difference between the plates of 80 V. If the charge on one of the plates of the capacitor is +8.0 ?C, what is the electrical energy stored by this capacitor
A sphere of mass M is supported by a string that passes over a pulley at the end of a horizontal rod of length L, Find the mass of the portion of the string above the rod
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