A 100-? resistor is connected in series with a 10-mH inductor across an ac source operating at 1000 Hz. What is the impedance of this circuit?
A) 100 ?
B) 118 ?
C) 200 ?
D) 236 ?
E) 1000 ?
B
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What power contact lens should be used to correct the vision of a farsighted person whose near point is 80 cm so she can see things clearly that are 25 cm in front of her?
A) +2.8 diopters B) -2.8 diopters C) -4.0 diopters D) -4.2 diopters E) +4.2 diopters
The component in CFCs that is responsible for destroying ozone is ______________
Fill in the blank(s) with correct word
A sealed 89- tank is filled with 6000 moles of oxygen gas (O2) at an initial temperature of 270 K
The gas is heated to a final temperature of 350 K. The ATOMIC mass of oxygen is 16.0 g/mol, and the ideal gas constant is R = 8.314 J/mol · K = 0.0821 L · atm/mol · K. The initial pressure of the gas is closest to A) 0.15 MPa. B) 0.17 MPa. C) 0.19 MPa. D) 0.13 MPa. E) 0.11 MPa.
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2 sin (?x) cos (3?t) where x is in m and t is in s. What is the distance (in m) between the first two antinodes?
a. 8 b. 2 c. 4 d. 1 e. 0.5