A converging lens
A. refracts all light toward the focal point.
B. always has two curved surfaces.
C. always has a real image.
D. is thicker in the center than the edges.
Answer: D
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A: closer than one that appears larger. B: farther away than one that appears larger. C: there will be no trend.
Springs: It takes 87 J of work to stretch an ideal spring from 1.4 m to 2.9 m from equilibrium. What is the value of the spring constant (force constant) of this spring?
A. 27 N/m B. 77 N/m C. 52 N/m D. 39 N/m
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A particle (mass = 6.0 mg) moves with a speed of 4.0 km/s in a direction that makes an angle of 37° above the positive x axis in the xy plane. At the instant it enters a magnetic field of (5.0
) mT it experiences an acceleration of (8.0
) m/s2. What is the charge of the particle?
A. ?4.8 ?C B. 4.0 ?C C. ?4.0 ?C D. 4.8 ?C E. ?5.0 ?C