## Ask Singapore Homework?

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First two parts

Date Posted:
11 months ago

Lol this question again

When t = 3, the hour hand is horizontal and pointing rightwards.

The hand at this position makes an angle of π/2 rad with its previous position at the 12am mark.

Then h = 25

25 = 5(5 - 2 cos kt) = 25 - 10 cos kt

10 cos kt = 0 → coskt = 0

kt = π/2 rad

(We do not pick other bigger angles as the angle change from the 12am mark is not obtuse/is the magnitude of a right angle)

Since t = 3hr

3k hr = π/2 rad

k = π/6 rad/h

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Last part

Date Posted:
11 months ago