The hour hand on a clock points to 7. If the vector represented by the hour hand has a magnitude of 5 inches, what is the magnitude of its horizontal component?
7 oclock is an angle of 240o
( each hour represents 30 degrees 360/12 = 30 degrees 6 oclock is 270 o)
The horizontal component is 5 cos 240 = -2.5 magnitude = 2.5 ' inches '