The potential energy of a 3.5 pC charge separated by 6.2 cm from a 1.6 
C charge is
A. 
B. 
C. 
D. 
E. 
B.
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An open box-car has a mass of 30,000 kg and is moving on a level railroad track at 4.00 m/s. 1,000 kg of water falls straight down into the box-car. The velocity of the box-car after the water falls into the box- car is
A. 7.01 m/s. B. 6.55 m/s. C. 5.02 m/s. D. 3.87 m/s. E. 2.89 m/s.
In a RLC circuit, a second capacitor is connected in series with the capacitor previously in the circuit. What is the effect of this change on the impedance of the circuit?
A) It increases. B) It decreases. C) It does not change. D) It increases for frequencies below resonance and decreases for frequencies above resonance. E) It decreases for frequencies below resonance and increases for frequencies above resonance.
Explain why it so much more expensive to transmit electricity locally than over long distances. Give as many reasons for this as you can
What will be an ideal response?
The focal length of a concave mirror is 20 cm. What is its radius of curvature?
A) 10 cm B) 40 cm C) -40 cm D) 20 cm E) -20 cm