05_InstSolManual_PDF_Part15

05_InstSolManual_PDF_Part15 - Applications of Newtons Laws...

• Notes
• 1

This preview shows page 1. Sign up to view the full content.

5.32. Set Up: Assume that the normal force n at each hip is vertical. Solve: (a) The free-body diagram for the upper body of the person is shown in Figure 5.32. gives and Figure 5.32 (b) (c) 5.33. Set Up: The free-body diagram for the two crates treated as a single object, weight is shown in Figure 5.33a. The system doesn’t move so the friction force exerted by the roof is static friction. For the heaviest pallet of bricks this force has its maximum possible, The free-body diagram for the pallet of bricks is given in Figure 5.33b. Figure 5.33 Solve: (a) For the crates, gives and Then gives and For the bricks, gives and (b) For the upper crate the only horizontal force on the crate would be friction. This crate has so and the friction force is zero.
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Reflect: If some bricks are removed, so the weight of the pallet is reduced, the system remains at rest. The friction force on the crate is equal to the new weight of the pallet and is less than m s n . g F x 5 a x 5 w b 5 T 5 266 lb T 2 w b 5 g F y 5 ma y T 5 f s 5 266 lb T 2 f s 5 g F x 5 ma x f s 5 m s n 5 1 0.666 21 400 lb 2 5 266 lb. n 5 400 lb. n 2 w C 5 g F y 5 ma y ( a ) ( b ) x y w b T a 5 x y w c 5 400 lb n f s T f s 5 m s n . w C , f k 5 m k n 5 1 0.30 21 2.5 21 0.65 2 mg 5 1 0.30 / 0.0050 21 5.2 N 2 5 310 N f k 5 m k n 5 1 0.0050 21 2.5 21 0.65 2 mg 5 5.2 N x y w u 5 0.65 w n n a 5 n 5 w u / 2. 2 n 2 w u 5 g F y 5 ma y Applications of Newton’s Laws 5-15...
View Full Document

• Spring '07
• Shoberg

{[ snackBarMessage ]}

What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern