When a 4 cubic ft block of wood floats in a fluid whose weight density is 60 pounds per cubic foot, 3/4 of the block's volume is submerged. The buoyant force on the block is
a. 60 lbs
b. 120 lbs
c. 180 lbs
d. 240 lbs
e. none of the above
D
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A straight wire is bent into the shape shown. Determine the net magnetic force on the wire when the current I travels in the direction shown in the magnetic field 
.
?
?
A. 2IBL in the ?z direction B. 2IBL in the +z direction C. 4IBL in the +z direction D. 4IBL in the ?z direction E. zero
The oldest Earth rocks so far discovered and dated are _____
A) amethyst crystals B) rhodonite crystals C) zircon crystals D) turquoise crystals
A He-Ne laser, which produces light of wavelength 632.8 nm, is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5° from the central spot, what is the distance between the slits of the grating?
A) 0.905 µm B) 1.81 µm C) 2.20 µm D) 3.62 µm E) 4.52 µm
The area under the force-displacement curve represents:
a. area. b. work. c. force. d. coefficient of static friction.