Question #128969
(A) Safety regulations dictate that a ladder leaned against a building must be at an angle of 65°. A ladder that is 10.0 feet long will be used. How high up the side of building will the ladder safely reach? Include a diagram in your answer.

(B) A wind mill is 180 ft high. A guy wire will be fastened to the base of the windmill, 20 feet from the top and anchored into ground. The guy wire makes an angle of 40° with the ground. What length of the wire will be needed? Include a diagram in a diagram in your answer.
1
Expert's answer
2020-08-09T08:27:23-0400

A)


cosβ=a/ccos\beta=a/c

a=ccosβa = c ⋅ cos\beta

a=10cos65°=4.23feeta = 10 ⋅ cos 65° = 4.23 feet


B) a = 180 - 20 = 160 feet

α=40°\alpha=40°

sinα=a/csin\alpha = a/c

c=a/sinαc=a/sin\alpha

c=160/sin40°=248.92feetc=160/sin40° = 248.92 feet


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