You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 4 cm wide but 7 mm high. You must move your hand up and down once,
A. the same distance up as before, but take a shorter time.
B. the same distance up as before, but take a longer time.
C. a smaller distance up, but take a shorter time.
D. a greater distance up, but take a longer time.
E. a greater distance up, but take the same time.
Answer: E
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An initially uncharged parallel plate capacitor of capacitance C is charged to potential V by a battery. The battery is then disconnected. Which statement is correct?
a. There is no charge on either plate of the capacitor. b. The capacitor can be discharged by grounding any one of its two plates. c. Charge is distributed evenly over both the inner and outer surfaces of the plates. d. The magnitude of the electric field outside the space between the plates is approximately zero. e. The capacitance increases when the distance between the plates increases.
An atom or chemical combination of atoms with a net electric charge is called a(n) ______________
Fill in the blank(s) with correct word
A charge of uniform volume density (40 nC/m3) fills a cube with 8.0-cm edges. What is the total electric flux through the surface of this cube?
a. 2.9 N × m2/C b. 2.0 N × m2/C c. 2.6 N × m2/C d. 2.3 N × m2/C e. 1.8 N × m2/C
Conventional automobile efficiencies cannot conceivably be higher than about 25%, even with perfect engineering. This is due to
A) the law of conservation of energy. B) frictional loses inside the car plus unburned hydrocarbons. C) the second law of thermodynamics. D) road friction. E) air resistance plus road friction.