A ball is thrown vertically into the air. Because of air resistance, its speed when it returns to its starting level compared with its initial speed is
A) less.
B) the same.
C) more.
Answer: A
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Ethyl glycol at 90ºC flows at 10 m/s through 2 mm diameter heat exchanger tubes. The tube surface temperature is 30ºC at the entrance and the tube is 60 cm long. Estimate the outlet temperature of the ethyl glycol and the outlet tube surface temperature.
What will be an ideal response?
Two slits separated by 0.10 mm are illuminated with green light (? = 540 nm). Calculate the distance (in cm) from the central bright-region to the fifth bright band if the screen is 1.0 m away.
A. 2.3 B. 2.5 C. 2.7 D. 2.1 E. 2.0
A light beam has speed c in vacuum and speed v in a certain plastic. The index of refraction n of this plastic is
A) n = cv. B) n = (v/c)2. C) n = v/c. D) n = c/v. E) n = (c/v)2.
A steel ball has a mass equal to 5 kilograms. What is the ball's weight?