Suppose that you measure the position of a chair using a meter stick and you record the distance of the center of the seat from the wall. Which of the following measurements is the most reasonable?
1.1.043 860 564 2 m
2.1.043 860 m
3.1 m
4.1.04 m
4
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If a 20 W laser beam, which has an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after traveling 10,000 m, what is the initial intensity of the beam?
a. 
b. 
c. 
d. 
e. 
Granulation is evidence that energy in the photosphere ____
a. is flowing upward b. is flowing downward towards the core c. stays horizontal on the surface d. is spiraling westward e. is spiraling eastward
A rectangular coil (0.20 m × 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.080 N / m. What is the current in the coil?
a. 5.0 mA b. 1.7 A c. 8.3 mA d. 1.0 A e. 42 mA
A component in an automobile 12-V electrical system has a resistance of 90 ?. How much current is in the component when in operation?
a. 100 A b. 0.13 A c. 7.5 A d. 1100 A