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San Jose State University *

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112

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Mechanical Engineering

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Oct 30, 2023

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12/13/2020 Assignment Print View https://ezto.mheducation.com/hm.tpx?todo=C15PrintView&wid=13252714023657010&role=student&sid=13252715156178420 1/8 Score: 30/30 Points 100 %
12/13/2020 Assignment Print View https://ezto.mheducation.com/hm.tpx?todo=C15PrintView&wid=13252714023657010&role=student&sid=13252715156178420 2/8 1. Award: 10 out of 10.00 points You did not receive full credit for this question in a previous attempt Determine whether the block shown in the figure is in equilibrium and find the magnitude and direction of the friction force when θ = 40° and P = 395 N. Given: μ s = 0.20 and μ k = 0.15. The block is in equilibrium. true The magnitude and direction of the friction force is 43.4 N . References Worksheet Difficulty: Medium Determine whether the block shown in the figure is in equilibrium and find the magnitude and direction of the friction force when θ = 40° and P = 395 N. Given: μ s = 0.20 and μ k = 0.15.
12/13/2020 Assignment Print View https://ezto.mheducation.com/hm.tpx?todo=C15PrintView&wid=13252714023657010&role=student&sid=13252715156178420 3/8 The block is in equilibrium. true The magnitude and direction of the friction force is N . Explanation: Assume that the block is in equilibrium. Maximum friction force is calculated using the equation The block is in equilibrium. Since F < F m , 43.4461 ± 2%
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12/13/2020 Assignment Print View https://ezto.mheducation.com/hm.tpx?todo=C15PrintView&wid=13252714023657010&role=student&sid=13252715156178420 4/8
12/13/2020 Assignment Print View https://ezto.mheducation.com/hm.tpx?todo=C15PrintView&wid=13252714023657010&role=student&sid=13252715156178420 5/8 2. Award: 10 out of 10.00 points You received credit for this question in a previous attempt Determine whether the block shown is in equilibrium and find the magnitude and direction of the friction force when θ = 35° and P = 111 lb. Given: μ s = 0.3 and μ k = 0.2. The block is in equilibrium. true The magnitude and direction of the friction force is 52.4 lb . References Worksheet Difficulty: Medium Determine whether the block shown is in equilibrium and find the magnitude and direction of the friction force when θ = 35° and P = 111 lb. Given: μ s = 0.3 and μ k = 0.2.
12/13/2020 Assignment Print View https://ezto.mheducation.com/hm.tpx?todo=C15PrintView&wid=13252714023657010&role=student&sid=13252715156178420 6/8 The block is in equilibrium. true The magnitude and direction of the friction force is lb . Explanation: Assume that the block is in equilibrium. The maximum friction force is calculated using the equation We note that F < F m . Thus, The block is in equilibrium. Therefore, the friction force 52.4682 ± 2%
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12/13/2020 Assignment Print View https://ezto.mheducation.com/hm.tpx?todo=C15PrintView&wid=13252714023657010&role=student&sid=13252715156178420 7/8 NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A 6.5-m ladder AB leans against a wall as shown in the figure. References Section Break Difficulty: Medium
12/13/2020 Assignment Print View https://ezto.mheducation.com/hm.tpx?todo=C15PrintView&wid=13252714023657010&role=student&sid=13252715156178420 8/8 3. Award: 10 out of 10.00 points You received credit for this question in a previous attempt Assuming that the coefficient of static friction is zero at B , identify the smallest value of at A for which equilibrium is maintained. The free-body diagram of the ladder is According to three-force body: Line of action of A must pass through D , where W and B intersect. References Multiple Choice Difficulty: Medium

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