The drawing shows a per- son (weight, W = 584 N) doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assum- 12. ing that the person holds this position. 0.840 m 0.410 m
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- Two children push on opposite sides of a door during play. Both push horizontally and perpendicular to the door. One child pushes with a force of 17.5 N at a distance of 0.600 m from the hinges, and the second child pushes at a distance of 0.450 m. What force must the second child exert to keep the door from moving? Assume friction is negligible.Find the magnitude of the tension in each supporting cable shown below. In each case, the weight of the suspended body is 100.0 N and the masses of the cables are negligible.Check Your Understanding A 50-kg person stands 1.5 m away from one end of a uniform 6.0-m-long scaffold of mass 70.0 kg. Find the tensions in the two vertical ropes supporting the scaffold.
- Show that, as explained in the text, a force F exerted on a flexible medium at its center and perpendicular to its length (such as on the tightrope wire in Figure 5.26) gives rise to a tension of magnitude T=F/2sin() .The resultant of the three concurrent forces acting on the eyebolt is the force R = 600j l Determine the magnitude of the force P and the angle θ that specifies the direction of the 800-lb force.A uniform plank of length 2.00 m and mass 26.0 kg is supported by three ropes, as indicated by the blue vectors in the figure below. Find the tension in each rope when a 710–N person is d = 0.500 m from the left end. Answer the 3 boxes below:
- A window washer is standing on a scaffold supported by avertical rope at each end. The scaffold weighs 200 N and is3.00 m long. What is the tension in each rope when the 700-Nworker stands 1.00 m from one end?Find the tension in the two cords shown in the figure. Neglect the mass of the cords and assume that the angle θ is 33° and the mass m is 190-Kg.What's the force on each rope if the person is standing 1.75 m from one end?
- During most of the stance phase of the gait, the knee flexion is less than 20º. What force must the quadriceps muscle apply to maintain this flexion while standing on one leg? The patient's weight is 836N, assuming that the distance from the center of the joint to the line of gravity is 5 cm and the distance perpendicular to the center of the joint towards which the muscle acts is 5 cm, and the muscle acts ( pull) at 60º to the horizontal.What would be the maximum weight W of the block, shown in the following figure, so that the tension developed in any cable does not exeed 100 NFind the N2 in Newton's exerted on the beam by the support on the right end