Elsewhere, at Favabit, an employee receiving a court order for user data takes the encrypted user data to the three trusted employees who each know part of the decryption key. Together they verify the court order, decrypt the data, and pass it on to the court. A week later, one of the three trusted employees is forced to refuse a cartel bribe to get user data, because she does not have the power to unilaterally hand it over.
If you can't think of a way to allow legitimate access while protecting against illegitimate access, you simply aren't thinking creatively enough.
At the surface of the propeller, the velocity of the wind in the direction that the driver is facing is GREATER than the velocity of the propeller in the direction that the driver is facing.
No. The velocity of the propellor in the direction the driver is facing is exactly the same as the velocity of the vehicle in the direction the driver is facing, since the propellor's motion is the same as the vehicles plus some orthogonal component from rotation. Furthermore, since the car is going directly downwind faster than the wind, the velocity of the propellor in the direction the driver is facing is actually greater than the wind velocity, at the surface of the propellor.
In other words, the propellor, while extracting energy from the wind, is actually moving downwind faster than the wind. This is just like a sailboat sailing downwind faster than the wind (which is possible). Of course the sailboat isn't sailing directly downwind faster than the wind (which is impossible in an ordinary sailboat), but neither is the propellor. However, because of the relative motion of the propellor and the vehicle, the vehicle is moving directly downwind faster than the wind—all without violating any laws of physics.
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Elsewhere, at Favabit, an employee receiving a court order for user data takes the encrypted user data to the three trusted employees who each know part of the decryption key. Together they verify the court order, decrypt the data, and pass it on to the court. A week later, one of the three trusted employees is forced to refuse a cartel bribe to get user data, because she does not have the power to unilaterally hand it over.
If you can't think of a way to allow legitimate access while protecting against illegitimate access, you simply aren't thinking creatively enough.
No. The velocity of the propellor in the direction the driver is facing is exactly the same as the velocity of the vehicle in the direction the driver is facing, since the propellor's motion is the same as the vehicles plus some orthogonal component from rotation. Furthermore, since the car is going directly downwind faster than the wind, the velocity of the propellor in the direction the driver is facing is actually greater than the wind velocity, at the surface of the propellor.
In other words, the propellor, while extracting energy from the wind, is actually moving downwind faster than the wind. This is just like a sailboat sailing downwind faster than the wind (which is possible). Of course the sailboat isn't sailing directly downwind faster than the wind (which is impossible in an ordinary sailboat), but neither is the propellor. However, because of the relative motion of the propellor and the vehicle, the vehicle is moving directly downwind faster than the wind—all without violating any laws of physics.