Units and Measu...

When the planet Jupiter is at a distance of 824.7 million kilometers from the Earth, its angular diameter is measured to be 35.72” of arc. Calculate the diameter of Jupiter.

A man walking briskly in rain with speed v must slant his umbrella forward making an angle θ with the vertical. A student derives the following relation between θ and v : tan θ = v and checks that the relation has a correct limit: as v→0,θ→0, as expected. (We are assuming there is no strong wind and that the rain falls vertically for a stationary man). Which of the following is correct?

Horse power is unit of 

The significant digits in 0.000532 are