If a lamp has a resistance of 265 ? when it operates at 250 W, what current does it carry?
a. 1.0 A
b. 0.94 A
c. 0.97 A
d. 1.1 A
e. 1.9 A
c
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Energy and Mass: One of the first atomic bombs released energy equivalent to that of 20,000 tons of TNT explosive. How much mass was converted to energy by this explosion, given that 1000 tons of TNT produce 4.3 × 1012 J of energy. Incidentally, modern H-bombs have energy yields 1000 times as much! (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
The coil of a generator has 50 loops and a cross-sectional area of 0.25 m2. What is the maximum emf generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?
A) 100. V B) 50. V C) 400. V D) 75. V E) 0. V
Which statement is always correct when applied to a charge distribution located in a finite region of space?
a. Electric potential is always zero at infinity. b. Electric potential is always zero at the origin. c. Electric potential is always zero at a boundary surface to a charge distribution. d. Electric potential is always infinite at a boundary surface to a charge distribution. e. The location where electric potential is zero may be chosen arbitrarily.
Collisions in Two Dimensions: An 80-kg man is skating northward and happens to suddenly collide with a 20-kg boy who is ice skating toward the east. Immediately after the collision, the man and boy are seen to be moving together at 2.5 m/s in a direction 60° north of east. How fast was the boy moving just before the collision?
Fill in the blank(s) with the appropriate word(s).