23.72.Set Up:Find the force on her due to the momentum carried off by the light. Express this force in terms ofthe radiated power of the flashlight. Find the acceleration produced by this force.Solve: (a) The radiation pressure is Force is (pressure)A, so were Pis the power output of the flashlight. The acceleration produced by this force is gives (b)She could throw the flashlight in the direction away from the ship. By conservation of linear momentum shewould travel toward the ship with the same magnitude of momentum as she gave the flashlight.23.73.Set Up:For a totally reflective surface the radiation pressure is Find the force due to this pressure and express the force in terms of the power output Pof the sun. The gravitational force of the sun is Solve: (a) The sail should be reflective, to produce the maximum radiation pressure.(b)where Ais the area of the sail. where ris the distance of the sail from the sun.
This is the end of the preview.
access the rest of the document.