Q: A person bending forward to lift a load “with his back
A person bending forward to lift a load “with his back†(Fig. P8.23a) rather than “with his knees†can be injured by large force...
See AnswerQ: When a person stands on tiptoe (a strenuous position), the
When a person stands on tiptoe (a strenuous position), the position of the foot is as shown in Figure P8.24a. The total gravitational force on the body, F(g, is supported by the force n( exerted by th...
See AnswerQ: A 500.-N uniform rectangular sign 4.00 m wide
A 500.-N uniform rectangular sign 4.00 m wide and 3.00 m high is suspended from a horizontal, 6.00-m-long, uniform, 100.-N rod as indicated in Figure P8.25. The left end of the rod is supported by a h...
See AnswerQ: A window washer is standing on a scaffold supported by a vertical
A window washer is standing on a scaffold supported by a vertical rope at each end. The scaffold weighs 200 N and is 3.00 m long. What is the tension in each rope when the 700-N worker stands 1.00 m f...
See AnswerQ: A uniform plank of length 2.00 m and mass 30
A uniform plank of length 2.00 m and mass 30.0 kg is supported by three ropes, as indicated by the blue vectors in Figure P8.27. Find the tension in each rope when a 700.-N person is d = 0.500 m from...
See AnswerQ: A hungry bear weighing 700. N walks out on a beam
A hungry bear weighing 700. N walks out on a beam in an attempt to retrieve a basket of goodies hanging at the end of the beam (Fig. P8.28). The beam is uniform, weighs 200. N, and is 6.00 m long, and...
See AnswerQ: Figure P8.29 shows a uniform beam of mass m pivoted
Figure P8.29 shows a uniform beam of mass m pivoted at its lower end, with a horizontal spring attached between its top end and a vertical wall. The beam makes an angle u with the horizontal. Find exp...
See AnswerQ: A strut of length L = 3.00 m and mass
A strut of length L = 3.00 m and mass m = 16.0 kg is held by a cable at an angle of θ = 30.0° with respect to the horizontal as shown in Figure P8.30. (a) Sketch a force diagra...
See AnswerQ: You observe two helium balloons floating next to each other at the
You observe two helium balloons floating next to each other at the ends of strings secured to a table. The facing surfaces of the balloons are separated by 1–2 cm. You blow through the opening between...
See AnswerQ: A refrigerator of width w and height h rests on a rough
A refrigerator of width w and height h rests on a rough incline as in Figure P8.31. Find an expression for the maximum value θ can have before the refrigerator tips over. Note, the contac...
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