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January 26, 2015

January 26, 2015

Posted by **tank** on Monday, June 6, 2011 at 11:56pm.

2) In what direction is he from the starting point(measured as an angle counterwise from the east axis, units are deg)? (Northwest is the direction lying exactly half way between north and west.)

- physics -
**Henry**, Tuesday, June 7, 2011 at 5:12pm1. Northwest = (90+180)/2 = 135 deg.

X = hor = 5km + 7cos135 = 0.05km.

Y = ver = -5km + 7sin135 = -0.05km.

d = sqrt((0.05)^2 + (0.05))^2 = 0.71km.

= distance from starting point.

2. tanAr = Y/X = -0.05 / 0.05 = -1,

Ar = -77.58 deg. = Reference angle.

A = 180 + (-77.58) = 102.4 deg. = Direction.

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