Knocking Over a Post. One end of a post weighing 400 N and with height h rests on a rough horizontal surface with μs = 0.30. The upper end is held by a rope fastened to the surface and making an angle of 36.9° with the post ( Fig. P11.90 ). A horizontal force F → is exerted on the post as shown, (a) If the force F → is applied at the midpoint of the post, what is the largest value it can have without causing the post to slip? (b) How large can the force be without causing the post to slip if its point of application is 6 10 of the way from the ground to the top of the post? (c) Show that if the point of application of the force is too high, the post cannot be made to slip, no matter how great the force. Find the critical height for the point of application.
Knocking Over a Post. One end of a post weighing 400 N and with height h rests on a rough horizontal surface with μs = 0.30. The upper end is held by a rope fastened to the surface and making an angle of 36.9° with the post ( Fig. P11.90 ). A horizontal force F → is exerted on the post as shown, (a) If the force F → is applied at the midpoint of the post, what is the largest value it can have without causing the post to slip? (b) How large can the force be without causing the post to slip if its point of application is 6 10 of the way from the ground to the top of the post? (c) Show that if the point of application of the force is too high, the post cannot be made to slip, no matter how great the force. Find the critical height for the point of application.
Knocking Over a Post. One end of a post weighing 400 N and with height h rests on a rough horizontal surface with μs = 0.30. The upper end is held by a rope fastened to the surface and making an angle of 36.9° with the post (Fig. P11.90). A horizontal force
F
→
is exerted on the post as shown, (a) If the force
F
→
is applied at the midpoint of the post, what is the largest value it can have without causing the post to slip? (b) How large can the force be without causing the post to slip if its point of application is
6
10
of the way from the ground to the top of the post? (c) Show that if the point of application of the force is too high, the post cannot be made to slip, no matter how great the force. Find the critical height for the point of application.
Tweedledum and Tweedledee are carrying a uniform wooden board that is L = 3.00 m long and has a weight of www = 160 N. If Tweedledum applies an upward force of magnitude F1 = 60.0 N at the left end of the board, at what point and with what magnitude F2 of force does Tweedledee have to lift for the board to be carried?
a) see attached picture for question
One end of a uniform rod of weight w = 73.5 N and length L = 2.55 m is supported by a cable at an angle of ? = 37.0°above the rod. The other end rests on a small frictionless support and presses into a wall as shown in the figure.
Determine the magnitude n of the vertical normal force exerted by the support on the rod and find the magnitude T of the tension in the cable.
a uniform beam with a weight of 60 N and a length of 3.2 m is hinged at its lower end, and a horizontal force of magnitude 50 N acts at its upper end.The beam is held vertical by a cable that makes angle u = 25° with the ground and is attached to the beam at height h = 2.0 m. What are (a) the tension in the cable and (b) the force on the beam from the hinge in unit-vector notation?
Chapter 11 Solutions
University Physics with Modern Physics, Books a la Carte Edition (14th Edition)
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