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Consider a flat-plate solar collector placed horizontally on the flat roof of a house. The collector is 5 ft wide and 15 ft long, and the average temperature of the exposed surface of the collector is 100°F. The emissivity of the exposed surface of the collector is 0.9. Determine the rate of heat loss from the collector by convection and radiation during a calm day when the ambient air temperature is 70°F and the effective sky temperature for radiation exchange is 50°F. Take the convection heat transfer coefficient on the exposed surface to be 2.5 Btu/h · ft2 · °F.
Consider a current loop immersed in a magnetic field, as in Figure 22-34(a). It is given that B = 0.27 T and I = 9.5 A. In addition, the loop is a square 0.51 m on a side. Find the magnitude of the magnetic force exerted on each side of the loop.
A large cylindrical tank contains 0.720 of nitrogen gas at 22.0 and 1.20×105 (absolute pressure). What will be the pressure if the volume is decreased
a 181 g ball is tied to a string. it is pulled to an angle of 4.0 c and released to swing as a pendulum. a student with
a car is moving with constant velocity v and has wheels of radius r. the car drives over a clump of mud and the mud
A snow maker at a resort pumps 150 kg of lake water per minute and sprays it into the air above a ski run. The water droplets freeze in the air and fall to the ground, forming a layer of snow.
At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods. The length of each rod can be adjusted to be one-quarter of a wavelength of an electromagnetic wave whose frequency is 125 MHz. How long is ea..
A wire in the shape of a square has sides of 35 cm and a resistance of 8 ohms. the wire is being pulled out of a uniform magnetic field, B=650mT at a speed of 50cm/s. How much force does it take to pull the wire if the speed remains constant.
A baseball is thrown horizontally at the catcher, who is 60.0 ft away. It is thrown with a velocity of 87.5 mph. How far does the baseball fall during this pitch.
Did the acceleration of the marble increase as it traveled down the ramp? What would happen to the velocity and acceleration of the marble if the ramp were steeper
The metal plates of a TV tube are parallel and 12 mm apart. The potential difference between them is 12 kV. Find the force on an electron passing between the plates
What term applies to the substances at point A?
Calculate intrinsic carrier concentrations in Ge at temperatures 293 K (room temperature). J73 K (boiling point of water), and 253 K (wittier in Minnesota). Compare the results and formulate conclusions about the temperature dependence of carrier ..
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