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A manufacturer makes absorber plates that are 1.4 m x 1.0 m in size for use in solar collectors. Consider such a plate placed horizontally outdoors in calm air at 30°C. Surface temperature TS of the absorber plate is 110C. Back surface of the plate is insulated.
If the emissivity of surface is 0.8 determine the rate of heat loss by
(a) natural convection and
(b) radiation.
Kyle pushes a box across a rough floor with a horizontal force of 15N. If the box has a mass of 22kg and it accelerates at 0.5 m/s^2, what is the force of friction that acts upon it
1. Two boards are bolted together with two bolts, as shown. The squeeze force between the boards is 500 lbs. If the shear strength of each bolt is 5000 lbs and the coefficient of static friction between the boards is μs = 0.5, what is the maximum ..
he string in a yo-yo is wound around an axle of radius 0.529 cm. The yo-yo has both rotational, What is the speed of the yo-yo when it reaches the distance of 1.50 m
The centers of a 14kg lead ball and a 110g lead ball are separated by 8.0cm. What gravitational force does each exert on the other
A futuristic design for a car is to have a large disk-like flywheel within the car storing kinetic energy. The flywheel has mass 370 kg with a radius of 0.50 m and can rotate up to 520 rev/s. Assuming all of this stored kinetic energy could be transf..
if the fundmental source of a sound wave is a vibrating object, what is the fundamental source of an electomagnetic wave
A parallel-plate capacitor of capacitance C is connected to a battery of voltage V until it is fully charged. The energy density in the capacitor is then equal to u. If the same capacitor is then connected to a battery of voltage 2V its energy densit..
The drawing shows an intravenous feeding. With the distance shown, nutrient solution (? = 1010 kg/m3) can just barely enter the blood in the vein. What is the gauge pressure of the venous blood
A 3 kg box rests on a horizontal surface. An external force 40 N is applied to the box, 30 degrees inclined from top. the box starts its motion from the rest. Find the final speed of the box after it moves 5 meters to the right
A person fishing from a pier observes that five wave crests pass by in 7.4 s and estimates the distance between two successive crests to be 4.3 m. The timing starts with the first crest and ends with the fifth. What is the speed of the wave? m/s
At a wild-west show, a marksman fires a bullet at a12 g coin that's thrown straight up into the air. At what angle measured with respect to the horizontal does the bullet ricochet away from this collision
If a boat can move in still water at 28 mph, but it is moving west to cross a stream that flows 7.2 mph south. What velocity does the boat ultimately achieve
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