A mild steel weldment is bolted to another mild steel surface. The contact pressure is estimated at 20 atm and the expected heat transfer between the two parts is 300 Btu/hr?in^2. Estimate the temperature drop at the contact due to thermal contact resistance.
What will be an ideal response?
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The solar system contains about 100 billion stars
Indicate whether the statement is true or false
Which of the following general statements about light and Earth's atmosphere is not true?
A) X-rays from the Sun are absorbed in the thermosphere. B) Visible light from the Sun is absorbed in the exosphere. C) Ultraviolet from the Sun is absorbed in the stratosphere. D) Infrared light emitted by Earth itself is absorbed in the troposphere.
Engine #1 produces twice the power of engine #2. Can we conclude that engine #1 does twice as much work as engine #2?
a) yes b) no
Three loops of wire, one circular, one rectangular, and one square, are made from identical lengths of wire. If the loops are in the same increasing magnetic field perpendicular to the plane of the coils, which loop has the greatest induced emf?
a. the circular one b. the rectangular one c. the square one d. All three would have the same emf induced.