Water Is Drawn from a Well in a Bucket Tied $\times$

question 56

Multiple Choice

Water is drawn from a well in a bucket tied to the end of a rope whose other end wraps around a cylinder of mass 50 kg and diameter 25 cm.As you turn this cylinder with a crank,the rope raises the bucket.If the mass of a bucket of water is 20 kg,what torque must you apply to the crank to raise the bucket of water at a constant speed?

• A)24 N · m
• B)2.5 N · m
• C)80 N · m
• D)2.4 \(\times\) 10³ N · m
• E)49 N · m

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Definitions:

Weber's Law

A principle in psychology that states the smallest change in a stimulus, such as weight or brightness, that can be detected is a constant proportion of the stimulus level.

Absolute Threshold

The minimum stimulus intensity required to detect a stimulus at least half the time.

Sensory Adaptation

The mechanism by which sensory receptors reduce their sensitivity to sustained stimuli as time progresses.

Signal Detection Theory

A psychological theory that describes how individuals decide on the presence or absence of a stimulus under conditions of uncertainty.