A18 and A19. Two horses (Mr. Ed and one of his pals, for those who remember the

Question

A18 and A19. Two horses (Mr. Ed and one of his pals, for those who remember the great Mr. Ed) are pulling a barge as
shown. Mr. Ed and his friend can each work at a maximum rate of 2 horse power = 1500 W (Hey, this IS Mr. Ed,
remember -- he's one strong horse -- of course)
30o
30o
A18. If the water exerts a resistive force on the barge that varies with the barges speed as 120v (Newtons) where v is the
speed of the barge in the water, calculate the maximum speed steady speed of the barge when each horse is exerting his
maximum horsepower.
A19. Calculate the tension in the cables under the conditions described in A18, above.

Explanation / Answer

a18 . power P =Force x velocity

2 x 1500 = 120v.v

v2 = 3000/120

v = 5m/s

A19. T = F = 120 x 5 = 600 N

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