The activity of a radioactive source is often
measured in a unit called?
a) the joule
b) the u
c) the microgram
d) the cpm
d
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A cylindrical wire has a resistance R and resistivity ?. If its length and diameter are BOTH cut in half,
(a) what will be its resistance? A) 4R B) 2R C) R D) R/2 E) R/4 (b) what will be its resistivity? A) 4? B) 2? C) ? D) ?/2 E) ?/4 What will be an ideal response?
A certain force is required to keep a block of wood 1 m beneath the surface of water. The force required to keep it 2 m deep is
1) zero. 2) the same. 3) twice as much. 4) four times as much. This is because 6) pressure increases with increased depth. 7) it displaces the same weight of water at any depth. 8) wood floats. 9) surface tension is not present beneath the surface.
The atmosphere of Venus is 95% ________.
A. hydrogen B. carbon dioxide C. sulfuric acid D. water vapor
The equation below is the solution to a problem.
?
.
?
The best physical representation of this equation is
A. a sphere of 2.00-kg mass under a 6.00-N tension when at the bottom of a vertical circle. B. a sphere of 2.00-kg mass under a 6.00-N tension when at the side of a vertical circle. C. a sphere of 2.00-kg mass under a 6.00-N tension when at the top of a vertical circle. D. a sphere of 2.00-kg mass at any point on a horizontal circle. E. a 2.00-kg gecko running on the ceiling with a speed of 8.00 m/s.