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NonGayMan

NonGayMan said:

If you shine a light into a mirror, do you get twice as much light?

If a Truck is loaded with Helium, would it weigh less than when it was empty? Wouldn't it get better fuel mileage?

Which way does a compass point in space?

1: No, the photons just get reflected off the mirror.

2: Assuming "air" is considered empty, then no, helium is just of less weight. And yes, it wouldn't require as much fuel to move forwards, as the kinetic energy increases while the thermal energy decreases.

3: A compass in space points forwards.