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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 12.2° C and the rate of radiation is 84.0 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.)
n a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.6 ? 10-17 N during the first 1.9 cm of the tube's length, Find the speed of the electrons when they hit the screen
Two forces, and act at a point. The magnitude of is 9.80, and its direction is an angle 57.0 above the x-axis in the second quadrant. The magnitude of is 6.2, and its direction is an angle 52.7 below the x-axis in third quadrant.
A solenoid has a cross-sectional area of 2.20 10-4 m2, consists of 200 turns per meter, and carries a current of 0.56 A. Find the average current induced in the coil
The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg. The density of water is 1.00 g/cm3.
To which, according to the rotational analog of Newton's second law, is the angular acceleration experienced by an object directly proportional?
The steps in the accounting cycle for a merchandising company are different from the accounting cycle for a service company. Discuss whether or not you agree or disagree. Find out whether or not the measurement of net income.
A hot wheels track has a spring loaded launcher. A 100g car is pushed into the launcher, which compresses the spring by 2cm. The cars initial velocity after launching is 3m/s.
Would you expect to get a more accurate value for m using Equation m = h'/h in the situation where the lens is closest to the object or in the situation where the lens is furthest from the object?
The box has a mass of 31.0 kg, and the coefficient of kinetic friction between the box and floor is 0.530. The acceleration of gravity is 9.81 m/s2. Illustrate what is the acceleration of the box?
A metallic sphere has a charge of +4.2 nC. A negatively charged rod has a charge of -6.0 nC. When the rod touches the sphere, 9.8 109 electrons are transferred. What are the charges of the sphere and the rod now?
The sodium D line is a doublet consisting of two wavelengths, 588.995 and 589.592 nm. Calculate the angular separation between these two lines in the first-order spectrum for a grating with 4000 lines per centimeter. Repeat for the second order.
A point charge Q is trapped at the center of a thin-walled hollow conductive sphere of radius R, How much charge will collect on the inside surface of the hollow sphere
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