26. A ship's captain wishes to sail his ship north-east. A current is moving his ship with a velocity of 5.0 km/h (S). If the ship has a maximum speed of 30 km/h, what is the
ship's required heading?

By what primary heat transfer mechanism does the sun warm the earth?

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.

What do we mean by the event horizon of a black hole?