Author Question: A helicopter is flying horizontally with a speed of 444 m/s over a hill that slopes upward with a 2 ... (Read 212 times)

notis · **on:** Jul 29, 2018

A helicopter is flying horizontally with a speed of 444 m/s over a hill that slopes upward with a 2 grade (that is, the rise is 2 of the run).

What is the component of the helicopter's velocity perpendicular to the sloping surface of the hill? A) 8.9 m/s
B) 220 m/s
C) 435 m/s
D) 444 m/s

Question 2

What should be the angle between the reflecting surfaces of two plane mirrors in order for every incident beam to be parallel to its reflected beam?

A) 0
B) 30
C) 45
D) 60
E) 90