Homework Help: physics

Posted by tom on Thursday, March 10, 2011 at 5:27pm.

A car is driven east for a distance of 49 km, then north for 21 km, and then in a direction 30° east of north for 27 km. Determine (a) the magnitude (in km) of the car's total displacement from its starting point and (b) the angle (from east) of the car's total displacement measured from its starting direction.

physics - Henry, Saturday, March 12, 2011 at 12:31am
30deg E of N = 60deg CCW.

X = hor = 49 + 27*cos60,
X=49 + 13.5=62.5km=hor comp. of vector.

Y = ver = 21 + 27*sin60,
Y = 21 + 23.38 = 44.38km.

a. D = sqrt(x^2 + y^2),
D = sqrt(3906.25+1969.58),
D = 76.7km.

b. tanA = Y/X = 44.38 / 62.5 = 0.7101.
A = 35.4 deg = Direction.

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