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A brick with dimensions of 10.0cm x 10.0cmx40.0cm has an emissivity of .60 and a temperature of 46oc and is floating (via david copper field) in a 21oc room. Suppose the brick maintains its temperature (nuclear fusion in the core) how much energy does the brick lose in 10 minutes?
A converging lens has a focal length of 0.080 m. An objectis located 0.040 m to the left of this lens. where isthe final image located
A think disk of radius R carries a surface charge σ. It rotates with angular frequency ω about the z axis, which is perpendicular to the disk and through its center. What is B along the z axis? What is the magnetic moment of the spinning disk?
Suppose a planet is discovered orbiting a distant star with 11 times the mass of the Earth and 1/11 its radius. How does the escape speed on this planet compare with that of the Earth
a rocket with inital mass 1000 kg adjusts its thrust byvarying the rate at which mass is ejected. the ejection speedrelative to the rocket is 30 km/s. find at what rateis mass being ejected at that instant
oscillating voltage applied to an LRC circuit, V=110cos(120Ï€t), R = 1kΩ, L = 10mH, C = 4700 µF. find the phasor angle
a gas mixture contains 1.29 g n2 and 0.93 g o2 in a 1.49- l container at 23?.1. calculate the mole fraction of n2.2.
Fourteen moles of an ideal monatomic gas expand isothermally at a temperature of 75°C. what is the heat flow into the gas
X rays with a wavelength of 0.14nm undergo first-order diffraction from a crystal at a 73 degree angle of incidence. What is the angle of second-order diffraction
What minimum horsepower must a motor have to be able to drag a 350 kilogram block up a 15o ramp at a speed of 1.50 m/s if the coefficient of kinetic friction is 0.25
The suspension system of your 1200 kg car has a natural oscillation frequency of 2.00 Hz without functioning shock absorbers. At what speed are you driving
A pendulum of length 9.00 m is held out to point A. At the vertical position, an overhang effectively cuts the length of the pendulum by an amount equal to 3m. (That is, 3.0 m is no longer free to swing.) How long does this pendulum take for one o..
An infinitely long charged wire produces an electric field of magnitude 1.15 103 N/C at a distance of 51.0 cm perpendicular to the wire. The direction of the electric field is toward the wire. What is the charge distribution?
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