Ansel places an object 34.8 cm from a thin convex lens along the axis. If a real image forms at a distance of 13.2 cm from the lens, what is the focal length of the lens?
a. 34.8 cm
b. 21.3 cm
c. 13.2 cm
d. 9.57 cm
e. 21.6 cm
d
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Compounds of carbon are classified as ______________ compounds
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A 5.0 ?F and a 7.0 ?F capacitor are connected in series across an 8.0-V DC source. What is the voltage across the 5.0 ?F capacitor?
A) 0 V B) 8.0 V C) 2.7 V D) 3.6 V E) 4.7 V
Consider horizontal parallel plates with a fixed potential difference. The upper plate has a voltage difference of 30 V with the lower plate, and they are separated by 3 cm. You move the two plates carefully to a separation of 4 cm. What is the strength of the electric field between the plates?
A. 1000 volts/meter B. 750 volts/meter C. 7.5 volts/meter D. 3000 volts/meter