A straight 10-cm wire bent at its midpoint so as to form an angle of 90° carries a current of 10 A. It lies in the xy plane in a region where the magnetic field is in the positive z direction and has a constant magnitude of 3.0 mT. What is the magnitude of the magnetic force on this wire?
A. 3.2 mN
B. 2.1 mN
C. 5.3 mN
D. 4.2 mN
E. 6.0 mN
Answer: B
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Conversion of Units: The following conversion equivalents are given: 1.0 mile = 5280 ft 1.0 ft = 12 in 1 m = 39.37 in1.0 hour = 60 min 1.0 min = 60 sIf a deer runs at 4.7 mi/h, its speed, in meters per second, is closest to
A. 2.1 m/s. B. 1.7 m/s. C. 1.9 m/s. D. 2.3 m/s. E. 2.5 m/s.
Would a nitrogen atom in Venus's atmosphere, whose temperature is 740 K, eventually es-cape into outer space? Note that a nitrogen atom has a mass that is 14 times that of a hydro-gen atom. Recall that atoms eventually will escape if their average velocity is greater than 1/6 times the escape velocity of the planet. The escape velocity of Venus is 10 km/s. For comparison, a hydrogen atom has an average velocity of 2.5 km/s at a temperature of 300 K.
a. The average velocity of nitrogen atoms is 0.4 km/s, and nitrogen does not escape. b. The average velocity of nitrogen atoms is 1.0 km/s, and nitrogen does not escape. c. The average velocity of nitrogen atoms is 1.0 km/s, and nitrogen escapes. d. The average velocity of nitrogen atoms is 4.5 km/s, and nitrogen does not escape. e. The average velocity of nitrogen atoms is 4.5 km/s, and nitrogen escapes.
Which of the following has your "cosmic address" in the correct order?
A) you, Earth, solar system, Local Group, Local Supercluster, Milky Way Galaxy, universe B) you, Earth, solar system, Milky Way Galaxy, Local Group, Local Supercluster, universe C) you, Earth, Local Group, Local Supercluster, solar system, Milky Way Galaxy, universe D) you, Earth, solar system, Local Group, Milky Way Galaxy, Local Supercluster, universe E) you, Earth, Milky Way Galaxy, solar system, Local Group, Local Supercluster, universe
If CP for an ideal gas is 35.4 J/mol?K, which of the following is CV for this gas?
A. 12.5 J/mol?K B. 20.8 J/mol?K C. 29.1 J/mol?K D. 27.1 J/mol?K E. 43.4 J/mol?K