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Suppose a spaceship runs out of fuel near a star. The crew erects a square, white sail 7.06 km on a side, and adjusts it so it faces the star so the photons hit the sail head-on. At their current distance the intensity of the starlight at the ship's location is 6380 W/m2. Assume:
- the sail is totally reflective: the photons strike the surface and bounce off at the same speed.
- the central frequency of the photons from the star is the same as the photons from part a.
- the central frequency of the photons from the star is also the average frequency.
i. Find the magnitude of the force exerted by the photons on the sail:
F = N
ii. Find the temperature of the star's surface:
T = K
iii. If the star is evolving so its surface temperature is rising at 683 K per century, the rate at which the central frequency is changing is:
df/dt = Hz/century
Cliff and Will are carrying a uniform 2.0m board of mass 74kg. Will is supporting the board at the end while cliff is 0.6m from the other end, Find the normal forces exerted by Cliff and Will
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