A wooden block contains some nails so that its average density is exactly equal to that of water. If it is placed in a tank of water and released from rest when it is completely submerged, it will
A) rise to the surface.
B) sink to the bottom.
C) remain where it is released.
C
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One day, while swimming below the surface of the ocean, you let out a number of bubbles of air from your mouth. As the bubbles rise toward the surface, their diameters will
A) decrease. B) stay the same. C) increase. D) increase for half of the bubbles and decrease for the other half.
During each cycle of operation, a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room. How much work input is required in each cycle?
A) 712 J B) 586 J C) 460 J D) 310 J E) 126 J
Certain planes of a crystal of halite have a spacing of 0.399 nm. The crystal is irradiated by a beam of x-rays. First order constructive interference occurs when the beam makes an angle of 20° with the planes of the crystal surface
What is the wavelength of the x-rays? A) 0.24 nm B) 0.27 nm C) 0.17 nm D) 0.14 nm E) 0.21 nm
A small object has an angular diameter of 
When viewed through a magnifier, it has an angular diameter of 
What is the angular magnification in this case?
A. 4.0 B. 8.0 C. 16 D. 32 E. 8.5