Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115.°F. Six months later the temperature has dropped to -2.°F
How much space now exists between each rail? [ linear expansion coef. for steel is 12. × 10-6 C°-1]
0.78 cm
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A small rock in interplanetary space is called a
A) meteor. B) meteoroid. C) meteorite.
Consider a two-slit interference experiment like the one shown in figure Q3.7b. The distance between adjacent bright spots in the interference pattern on the screen (A) increases, (B) decreases, or (C) remains the same if, The distance between the slits and the screen increases.
A. increases B. decreases C. remains the same
An external heat source supplies heat to a system at a rate of 187 W as the system does work at a rate of 131 W. At what rate is the internal (thermal) energy of the system changing?
A) 320 W B) 56 W C) 190 W D) -56 W E) -320 W
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