The near point of a farsighted person is 65 cm. What power contact lens must he use to correct this problem and be able to read a book at a normal near point of 25 cm?
A) -4.2 diopters B) +4.2 diopters C) -2.4 diopters D) -2.5 diopters E) +2.5 diopters
E
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The phase angle in a series RL circuit at 1.0 kHz with a 0.20-k? resistor and a certain inductor is 40°. What is the inductance in this circuit?
A) 27 mH B) 37 mH C) 58 mH D) 84 mH E) 74 mH
A capacitor of unknown capacitance C is charged to 100 V and then connected across an initially uncharged 60-mF capacitor. If the final potential difference across the 60-mF capacitor is 40 V, determine C
a. 49 mF b. 32 mF c. 40 mF d. 90 mF e. 16 mF
What is the circular velocity of an object orbiting Earth at a distance of 100,000 km from Earth's center? Hint: ; G = 6.67 10^-11 m3/s2/kg
a. 0.2 m/s b. 2 m/s c. 20 m/s d. 200 m/s e. 2,000 m/s
How do atmospheric windows limit observations made from Earth's surface?
What will be an ideal response?