Vision Problems: What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is at 60 cm?
A. -60 cm
B. -30 cm
C. +30 cm
D. +60 cm
E. +130 cm
Answer: A
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Kinetic Energy: Calculate the amount of energy needed to accelerate an electron from 0.888 c to 0.991 c. Express your answer in MeV. The mass energy of an electron is 0.511 MeV.
A. 2.71 MeV B. 1.89 MeV C. 4.60 MeV D. 5.68 MeV
What is the self-inductance in a coil that experiences a 2.30-V induced emf when the current is changing at a rate of 160 A/s?
a. 6.96E–1 H b. 3.31E–2 H c. 160 H d. 1.44E–2 H e. 3.68E+1 H
Suppose the two plates of a parallel-plate capacitor have fixed charges Q and -Q. If we double the gap between the plates, the (a) potential difference between the plates,
A. quadruples. B. doubles. C. remains the same. D. is reduced by a factor of two. E. is reduced by a factor of four. F. some other result (specify).
How far does light travel in 100 years?
A: 100 miles. B: 100 wavelengths. C: 100 light years. D: 100 astronomical units. E: 100 parsecs.