A 1520-N Crate Is to Be Held in Place on a Ramp

question 84

Short Answer

A 1520-N crate is to be held in place on a ramp that rises at 30.0° above the horizontal (see figure). The massless rope attached to the crate makes a 22.0° angle above the surface of the ramp. The coefficients of friction between the crate and the surface of the ramp are µ_k = 0.450 and µ_s = 0.650. The pulley has no appreciable mass or friction. What is the MAXIMUM weight w that can be used to hold this crate stationary on the ramp?

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Definitions:

Delayed Reinforcement

A method of reinforcement in which there is a delay between the target behavior and the delivery of the reinforcing stimulus, affecting the strength and rate of the behavior.

Conditioned Stimulus

A previously neutral stimulus that, after being associated with an unconditioned stimulus, evokes a conditioned response.

Conditioned Response

A learned response to a previously neutral stimulus that has become associated with an unconditioned stimulus.

Cigarette Smoke

The smoke produced by burning tobacco in cigarettes, which contains a complex mixture of chemicals harmful to health.