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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When you are scuba diving, the pressure on your face plate
A) is independent of both depth and orientation. B) will be greatest when you are facing downward. C) depends only on your depth, and not on how you are oriented. D) will be greatest when you are facing upward.
Two forces produce equal torques on a door about the door hinge. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door
Which force has a greater magnitude? A) the first force (at the midpoint) B) the second force (at the doorknob) C) The two forces are equal.
A box is placed on a table which rests on the floor. The box pushes on the table; the reaction force to the box's push on the table is the table's push on the floor
A) True B) False
Describe the seafloor spreading theory
What will be an ideal response?