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It takes four barbarians to turn the wheel below. How many barbarians would it take if the wheel radius were doubled and the axle radius stayed the same?



A. Fewer than four barbarians.
B. Exactly four barbarians.
C. More than four barbarians.
D. Not enough information.

Respuesta :

Robyy516
B.Exactly four barbarians
MathPhys

Answer:

A. Fewer than four barbarians.

Explanation:

Mechanical advantage = wheel radius / axle radius

If the wheel radius doubles and the axle radius stays the same, then the mechanical advantage doubles.  That means the effort force is half.  So we expect it would take half as many barbarians to turn the wheel.