A wind of velocity 10 m/s is blowing through a wind generator with blade radius 5.00 meters. What is the maximum power output if 30.0% of the wind's energy can be extracted? ?air = 1.25 kg/m3
a. 7.20 kW
b. 14.7 kW
c. 21.3 kW
d. 29.4 kW
e. 39.6 kW
b
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A positive point charge q is placed off center inside an uncharged metal sphere insulated from the ground as shown. Where is the induced charge density greatest in magnitude and what is its sign?
?
?
A. A; negative B. A; positive C. B; negative D. B; positive E. C; negative
Is it possible for each of three stationary charged particles to repel both of the other particles?
1.yes 2.no
By what factor is the self-inductance of a solenoid changed if only its number of coil turns, N, is doubled?
a. 8 c. 4 b. 1/2 d. 2
You have discovered a new asteroid, which has a moon in an elliptical orbit around it. From a series of observations, you establish that the closest approach occurs when the moon is 49,000 m from the asteroid,
the furthest separation is 98,000 m, and the speed of the moon at the point of closest approach is 7.50 m/s. What is the mass of the asteroid? G = 6.67 x 10-11 N•m2/kg2. A) 4.25 × 1016 kg B) 9.87 × 1016 kg C) 3.10 × 1016 kg D) 2.04 × 1016 kg E) 5.05 × 1016 kg