Impedance: A 120-V rms voltage at 60 Hz is applied across an inductor and a 200-? resistor. If the impedance of this circuit is 216 ?, what is the rms value of the current?
A. 0.336 A
B. 0.446 A
C. 0.556 A
D. 0.667 A
E. 0.767 A
Answer: C
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A uniform wooden plank floats in a swimming pool. The plank weighs 100 pounds, and exactly 10% of its volume is above the waterline. The maximum weight of iron which could be suspended from underneath the plank without causing the whole combination to sink to the bottom of the pool is
A. somewhat more than 10 pounds. B. somewhat less than 10 pounds. C. exactly 10 pounds. D. More information is needed
The period of a pendulum is 2.0 s in a stationary inertial frame of reference. What is its period when measured by an observer moving at a speed of 0.80c with respect to the inertial frame of reference?
a. 1.6 s c. 2.5 s b. 1.2 s d. 3.3 s
What is the upper limit of stars the unaided eye can discern on a moonless night in a rural area?
A) about 3000 B) about 30,000 C) about 300,000 D) about 3,000,000
In a nonlinear elastic material, the ratio of the increment in applied stress to the increment in strain measured at the total strain is the _____________modulus.
Fill in the blank(s) with the appropriate word(s).