Energy in Capacitors: An air-filled parallel-plate capacitor is constructed with a plate area of 0.40 m2 and a plate separation of 0.10 mm. It is then charged to a potential difference of 12 V? (?0 = 8.85 × 10-12 C2/N ? m2)(a) How much charge is stored on each of its plates?(b) How much energy is stored in it?
What will be an ideal response?
(a) 0.42 µC (b) 2.5 µJ
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Equilibrium: A 320-g ball and a 400-g ball are attached to the two ends of a string that goes over a pulley with a radius of 8.7 cm. Because of friction in its axle, the pulley does not begin to rotate. What is the magnitude of the frictional torque at the axle of the pulley if the system remains at rest when the balls are released?
A. 0.068 N ? m B. 0.61 N ? m C. 0.079 N ? m D. 0.063 N ? m E. 0.00070 N ? m
What key event marks the transition of a protostar into a true (main-sequence) star?
A) the onset of sustained nuclear fusion in its core B) the clearing of the gas from the surrounding gas cloud into interstellar space C) the moment when the luminosity first matches the luminosity of the lowest-mass main sequence stars D) the onset of a strong stellar wind
Good examples of a multicellular organisms which can exist under an enormous range of conditions are
A) tardigrades B) algae C) corals D) molds
Your radio is tuned to 98 on the FM dial. What electromagnetic wave frequency is your radio receiving, and how fast is this wave traveling?
A) 98 × 106 Hz, at the speed of sound B) 98,000 Hz, at the speed of sound C) 98 Hz, at a speed of 300,000 km/s D) 98,000 Hz, at a speed of 300,000 km/s E) 98 × 106 Hz, at a speed of 300,000 km/s