Consider a long thin straight wire with a current I. Which of the following statements about the magnetic field lines is true?
A. Field lines are parallel to the wire.
B. Field lines are perpendicular to the wire.
C. Field lines are directed radially away from the wire.
D. Field lines are circles centered on any point on the wire.
1.A only
2.B only
3.C only
4.D only
5.A and C only
6.B and D only
7.B and C only
8.None of them is true.
6
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The radius of the earth’s (almost circular) orbit around the sun is 150,000,000 km, and it takes 1 y for the earth to go around the sun. Imagine that a certain satellite goes in an almost circular orbit of radius 15,000 km around the earth (this radius is 10,000 times smaller than the earth’s orbital radius around the sun). What is the period of this orbit?
A. 10-6 y B. 10-4 y C. 10-3 y D. 106 y E. These periods are not related in any simple way.
How far does a beam of light travel in one full year?
A) 80 × 1012 m B) 95 × 1014 m C) 30 × 108 m D) 20 × 1015 m E) 36 × 1016 m
Which of the following contributes to the problem of greenhouse-effect heating of the atmosphere?
A) Coal-burning power plants B) Gasoline-fueled automobile engines C) Both of the above. D) Nuclear power plants E) All of the above.
The quantity "stress" expressed in terms of the fundamental quantities (mass, length, time) is equivalent to
a. MLT?1. b. ML?1T?2. c. M2L?1T?3. d. a dimensionless quantity.