Answer to Question 8

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Trevor's bike will not work:

  • The motor will need to take in more than 100 J/s because of the friction inside the motor and the waste heat in the windings.

  • The bicycle will need an outside power source to keep it going (i.e. Trevor's legs);

  • There is friction from the road and drag from the air;

  • He assumes the machine will be 100 % efficient, which it won't be.