Engineering, 18.09.2019 00:00 bnnn
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 124°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 on 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 as 2.5 btu/h·ft2·°f.
Answers: 1
Engineering, 03.07.2019 15:10
If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.
Answers: 1
Engineering, 04.07.2019 18:10
Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise
Answers: 3
Engineering, 04.07.2019 18:10
At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.
Answers: 1
Engineering, 04.07.2019 18:20
Determine the damped natural frequencies and the steady state response of a decoupled damped forced two degrees of freedom system. 10ä1 + 2q1 20q1 10 cos t; 10q2 +4q2 + 40q2 10 cos t
Answers: 3
Consider a flat-plate solar collector placed horizontally on the flat roof of a house. the collector...
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