Physics 18 Spring 2011 Homework 3 Wednesday February ... - Faculty

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4. A 35.0-kg traffic light is supported by

two wires as in the figure. (a) Draw the

light’s free-body diagram and use it to

answer the following question qualitatively:

Is the tension in wire 2 greater

than or less than the tension in wire 1?

(b) Verify your answer by applying Newton’s

laws and solving for the two tensions.

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4. A 35.0-kg traffic light is supported by two wires as in the figure. (a) Draw the light’s free-body diagram and use it to answer the following question qualitatively: Is the tension in wire 2 greater than or less than the tension in wire 1? (b) Verify your answer by applying Newton’s laws and solving for the two tensions. 4

5. A 65-kg student weights himself by standing on a force scale mounted on a skateboard that is rolling down an incline, as shown in the figure. Assume there is no friction so that the force exerted by the incline on the skateboard is normal to the incline. What is the reading on the scale if θ = 30 ◦ ? 5

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