Ch 8

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Unformatted text preview: 683 81. Determine the minimum horizontal force P required to hold the crate from sliding down the plane. The crate has a mass of 50 kg and the coefficient of static friction between the crate and the plane is . m s = 0.25 © 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. P 30 8 8 Solutions 44918 1/27/09 1:51 PM Page 683 684 82. Determine the minimum force P required to push the crate up the plane.The crate has a mass of 50 kg and the coefficient of static friction between the crate and the plane is . m s = 0.25 © 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. P 30 8 8 Solutions 44918 1/27/09 1:51 PM Page 684 685 83. A horizontal force of is just sufficient to hold the crate from sliding down the plane, and a horizontal force of is required to just push the crate up the plane. Determine the coefficient of static friction between the plane and the crate, and find the mass of the crate. P = 350 N P = 100 N © 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. P 30 8 8 Solutions 44918 1/27/09 1:51 PM Page 685 686 * 84. If the coefficient of static friction at A is and the collar at B is smooth so it only exerts a horizontal force on the pipe, determine the minimum distance so that the bracket can support the cylinder of any mass without slipping. Neglect the mass of the bracket. x m s = 0.4 © 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. 200 mm x 100 mm B A C 8 Solutions 44918 1/27/09 1:51 PM Page 686 687 85. The 180-lb man climbs up the ladder and stops at the position shown after he senses that the ladder is on the verge of slipping. Determine the inclination of the ladder if the coefficient of static friction between the friction pad A and the ground is .Assume the wall at B is smooth.The center of gravity for the man is at G .Neglect the weight of the ladder....
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