Question

For a man who wants to cross the river, with the shortest path `AB`, find the anglet `theta` (see figure)

A. `sin^(-1)(3/4)`
B. `sin^(-1)(4/3)`
C. `30^(@)`
D. Given situation is not possible

Answer 1

(d) For the man to cross the river frm the shortest path,
`V_(m) sin theta=v_(r)`
`sin theta=(v_(r))/(v_(m))`
`sin theta=4/3`
`theta =sin^(-1)(4/3)`
But it is not possible, because `sin theta` could not be greater than `t`. Hence the man could not cross the river from the shortest path `AB`.