A15-? resistor is connected in parallel with a 30-? resistor. If this combination is now connected in series with an ideal 9.0-V battery and a 20-? resistor, what is the current through the 15-? resistor?
A) 0.10 A
B) 0.13 A
C) 0.20 A
D) 0.26 A
C
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If a negative charge is placed inside a hollow isolated conductor that is originally neutral and the charge does not touch that conductor at any time:
a. both the inner and outer surfaces will become negative. b. both the inner and outer surfaces will remain neutral. c. the outside surface of the conductor will become positively charged. d. the inside surface of the conductor will become positively charged.
A fountain sends water to a height of 100 meters. What must be the pressurization (above atmospheric) of the water system? 1 atm= 1.01 × 105 N/m2.
A. 1.0 atm B. 4.2 atm C. 7.2 atm D. 9.7 atm E. 8.2 atm
The variables m1 and m2 that appear in the equation F = Gm1m2/r2 are
a. the straight-line distance between the centers of each object. b. the rate at which each object is moving. c. the mass of each object. d. the diameter of each object.
What did Millikan measure in his oil-drop experiment?
A) the electric charge of an electron B) the mass of an electron C) the mass of oil drops D) none of the above