Asked by Serena
A clock has hands 1 and 1 3/5 inches long respectively. At what rate are the ends of the hands approaching each other when the time is 2 o'clock?
Answers
Answered by
Steve
with the center of the clock at (0,0), the distance z between the tips at t minutes after 12:00 is
z^2 = m^2+h^2
z dz/dt = m dm/dt + h dh/dt
m = 8/5 cos(π/30 t)
h = cos(π/360 t)
Now just plug in the numbers at t=120
z^2 = m^2+h^2
z dz/dt = m dm/dt + h dh/dt
m = 8/5 cos(π/30 t)
h = cos(π/360 t)
Now just plug in the numbers at t=120
Answered by
Steve
sorry about z. It is really found using the law of cosines
z^2 = (8/5)^2 + 1^2 - 2(8/5)cosθ
where θ is the angle between the hands. I'm sure you can figure that out.
z^2 = (8/5)^2 + 1^2 - 2(8/5)cosθ
where θ is the angle between the hands. I'm sure you can figure that out.
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