The horsepower (hp) that a shaft can safelytransmit varies jointly with its speed (in revolutions perminute, rpm) and the cube of its diameter. If a shaft of acertain material 2 inches in diameter can transmit 36 hp at75 rpm, what diameter must the shaft have in order to transmit45 hp at 125 rpm?

Elementary Algebra
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ISBN:9780998625713
Author:Lynn Marecek, MaryAnne Anthony-Smith
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Chapter8: Rational Expressions And Equations
Section8.9: Use Direct And Inverse Variation
Problem 508E: The area of the face of a Ferris wheel varies directly with the square of its radius. If the area of...
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The horsepower (hp) that a shaft can safely
transmit varies jointly with its speed (in revolutions per
minute, rpm) and the cube of its diameter. If a shaft of a
certain material 2 inches in diameter can transmit 36 hp at
75 rpm, what diameter must the shaft have in order to transmit
45 hp at 125 rpm?

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