Question

A person walks in the following pattern: 2.8 km north, then 2.9 km west, and finally 5.5 km south. (a) How far and (b) at what angle (measured counterclockwise from east) would a bird fly in a straight line from the same starting point to the same final point?

Answer 1

during a hockey game, a puck is given an initial speed of 10m/s. it slides 50m on the ice before it stops. what is the coeff of kin friction between the puck and ice?

Answer 2

S 5.5 - 2.8 = 2.7 km
W 2.9 km

magnitude = sqrt(2.7^2+2.9^2)

angle A s of w
tan A = 2.7/2.9

angle desired = 180 + A

Answer 3

average speed = 10/2 = 5
distance = 50
so stop time = 50/5 = 10 seconds
a = change in speed/change in time
=-10/10 = -1 m/s^2

so F = m a
mu m g = m a
mu = 1/9.81