A long straight wire (diameter = 2.0 mm) carries a current of 25 A. What is the magnitude of the magnetic field 0.50 mm from the axis of the wire?
a. 5.0 mT
b. 10 mT
c. 0.63 mT
d. 2.5 mT
e. 0.01 mT
D
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A gasoline engine with an efficiency of 40.0% operates between a high temperature T1 and a low temperature T2 = 320 K. If this engine operates with Carnot efficiency, what is the high-side temperature T1?
a. 1070 K c. 533 K b. 868 K d. 457 K
The prediction from special relativity that the length of a moving object will be shortened in the direction of motion is
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.
A 0.250 mole sample of an ideal gas has a volume of 0.00200 
a pressure of 2.00 atmospheres. What is the temperature of the sample of gas?
A. 153 K B. 166 K C. 175 K D. 185 K E. 195 K
The weight of a 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is 100 cm2?
A) 11.6 × 105 Pa B) 11.6 × 104 Pa C) 2.9 × 105 Pa D) 2.9 × 104 Pa