The laws of refraction and reflection are the same for sound as for light. The speed of sound in air is 340 m/s and in water it is 1510 m/s. If a sound wave approaches a plane water surface at an angle of incidence of 12.0°, what is the angle of refraction?
What will be an ideal response?
67.4°
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How are air convection cycles generated?
What will be an ideal response?
The detectors on the Spitzer Space Telescope were cooled to near absolute zero in order to:
A) allow the electronics in these instruments to operate most efficiently. B) keep the telescope more nearly stationary. C) prevent the infrared radiation from the instruments interfering with the infrared signals from space. D) improve the angular resolution of the telescope.
A boat that contains a heavy anchor floats in a small lake. If the anchor is thrown overboard such that it rests upon the lake bottom, which of the following will happen?
(i) The level of the water in the lake will go down slightly. (ii) The level of the water in the lake will go up slightly. (iii) The level of the water in the lake will stay exactly the same. (iv) The waterline on the boat will go up (that is, the boat will sink slightly). (v) The waterline on the boat will go down (that is, the boat will rise slightly). (vi) The water line on the boat will stay the same.
1.(i) and (v) 2.(ii) and (iv) 3.(iii) and (vi) 4.(iii) and (v)For the fin shown, write the necessary node equations to solve for the nodal temperatures. Assume that the initial temperature throughout the fin is 250ºC. The surrounding ambient temperature is 10ºC and the convective heat transfer coefficient is 200 W/m^2 K.
