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A person sitting quietly in a room on a winter day may lose heat primarily by radiation from the outer surface of her clothes to the walls of the room. If the walls are at 15.0° C and the rate of radiation is 76.8 kcal/h (a typical basal metabolic rate), what is the temperature of the outer surface of the clothes, which have an emissivity of 0.800? (Assume the surface area of the person is 1 m2.)
What is the approximate mass of an object whose weight equals the force in part (b).
Suppose Magnetic monopoles may exist, first start off by writing maxwells equations in electro- and magneto-statics and also write down the usual Lorentz force law for a charge in E and B fields. Now modify these 5 equations to allow for the possi..
A hydraulic cylinder with a radius of 0.0281 m has a piston on the left end and a safety valve at the right end. The safety valve is a circular opening with a radius of 0.00650m, sealed with a disk. The disk is held in place by a spring (spring co..
A 2130 satellite used in a cellular telephone network is in a circular orbit at a height of 800above the surface of the earth. What fraction is this force of the satellite's weight at the surface of the earth
A 35.0-g bullet moving at 475 m/s strikes a 3.2-kg bag of flour that is on ice, at rest. The bullet passes through the bag, leaving at 225 m/s. How fast is the bag moving while the bullet exits.
A hot water stream at 80 degrees C enters a mixing chamber with a mass flow rate of 0.5kg/s where it is mixed with a stream of cold water at 20 degrees C. If it is desired that the mixture leave the chamber at 42 degrees C,
A nuclear power plant draws 3.5 x 10^6L/min of cooling water from the ocean, what is the water speed in each pipe
A solenoid is wound with a single layer of copper wire of radius 0.480 cm. What is the inductance of the solenoid per unit length
You, Archimedes, suspect that the king's crown is not solid gold but is instead gold-plated lead. To test your theory, you weigh the crown, and find it to weigh 60.0 N, What percentage (by weight) of this crown is made of gold
The position of the front bumper of a test car under microprocessor control is given by x(t) = 2.07 m + (4.50 m/s2)t2 - (0.100 m/s6)t6. Find its position at the first and second instants when the car has zero velocity
A man is pushing a heavy box across the floor. The box weighs 95 lbs. The man is pushing forward on it with a force of 56 lbs. What is the resultant horizontal force on the box
A car (m = 2,000 kg) has an initial speed of 40 m/s and the driver applies the brakes over a distance of 200 meters until the car comes to a stop
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