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OpenStudy (anonymous):
how does a solar sail work if a photon has no mass. I saw something on the discovery channel about it, but how can a sail work if what is striking it has no inertia?
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OpenStudy (anonymous):
Photons have no mass. But they have momentum,.\[P ={ E \over c} \] P: momentum E: the energy of the photon C: the speed of light
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