At which lunar phase(s) are tides most pronounced (for example, the highest high tides)?
A) both first and third quarters
B) both new and full Moons
C) full Moon only
D) new Moon only
E) third quarter Moon only
D
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The most important property that determines the evolution of a star is its
A. composition. B. mass. C. temperature. D. location.
A uniform pressure of 5.7 × 10^5 N/m2 is applied to all six sides of a copper cube. What is the percentage change in volume of the cube? (for copper, B = 14 × 10^10 N/m2)
a. 0.00070% b. 0.00040% c. 0.0000020% d. 0.00041%
A solenoid of length 0.700 m having a circular cross-section of radius 5.00 cm stores 6.00 µJ of energy when a 0.400-A current runs through it. What is the winding density of the solenoid? (?0 = 4? × 10-7 T ? m/A)
A) 104 turns/m B) 327 turns/m C) 1080 turns/m D) 865 turns/m E) 472 turns/m
In a capacitor in an AC circuit, the voltage:
a. lags the current by 90°. b. may lead or lag the current depending on the frequency. c. leads the current by 90°. d. is in phase with 70.7% of the current.