For a touring bicyclist the drag coefficient C (where fair)=1/2CAv^2) is 1.07, the frontal area A is 0.469 m^2, the air density is 1.20 kg/m^3,and the coefficient of rolling friction is 4.50×10^-3. The rider has mass 58.0 kg, and her bike has mass 12.2 kg. a) To maintain a speed of 11.8 m/s on a level road, what must the rider's power output to the rear wheel be?
P=W
b) For racing, the same rider uses a different bike with a coefficient of rolling friction 3.40×10^-3 and mass 8.80 kg. She also crouches down, reducing her drag coefficient to 0.880 and reducing her frontal area to 0.370 m^2. What must her power output to the rear wheel be then to maintain a speed of 11.8 m/s?
P=W
c) For the situation in part B, what power output is required to maintain a speed of 6.70 m/s?
P=W

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c.arachnids

  scorpions are animals in the order scorpiones, under the class arachnida, which makes them a distant cousin of spiders

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electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia