Determine the expected temperature drop at the contact between two 304 stainless steel parts if the overall temperature drop across the two parts is 100ºC.
What will be an ideal response?
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Which of the following is evidence that solar activity affects Earth's climate?
A. The dust bowl of the 1930s in the United States coincided with the complete disappearance of sunspots during that time. B. The Maunder Minimum-a period of abnormally low sunspot numbers-coincided with abnormally cold northern winters. C. The Schwab Cycle-a period of abnormally numerous and large sunspots-preceded a 250-year drought in Africa. D. All of these choices are correct.
Which of the following statements is true of brown dwarfs?
A) They are almost the same size as Jupiter. B) They emit most of their energy as gamma rays. C) They generate energy by hydrogen fusion. D) They are high-luminosity objects.
Two charged bodies separated by a distance d exert an electrical force on each other. The charge on one of the bodies is doubled. The electrical forces on each body now
a. double. b. decrease by 1/2. c. stay the same. d. differ—the force on the other body doubles, but the force on the body whose charge was changed stays the same as before. e. increase by a factor of four.
Force on a Moving Charge: An electron, moving west, enters a magnetic field. Because of this field the electron curves upward. We may conclude that the magnetic field must have a component
A. towards the north. B. towards the south. C. upward. D. downward. E. towards the west.