3.0m 25*

An 80 kg construction worker sits down 2.0 m from the end of a 1450 kg steel beam to eat his lunch, as shown. The cable supporting the beam is rated at 15,000 N. Should the worker be worried?

Q13. A 5 meter, 200N-long ladder rests against a wall. The ladders center of mass is 3.0 meters up the ladder. The coefficient of friction on the ground is 0.30. How far along the ladder can a 75-kg person climb before it slips? The angle between the ladder and ground is 56 degrees. (2.0 m)

The two ends of the dumbbell shown below are made of the same material. Is the dumbbell’s center of gravity at point 1, 2, or 3? Explain.

When you bend over, a series of large muscles, the erector spinae, pull on your spine to hold you up. Figure shows a simplified model of the spine as a rod of length L that pivots at its lower end. In this model, the center of gravity of the 320 N weight of the upper torso is at the center of the spine. The 160 N weight of the head and arms acts at the top of the spine. The erector spinae muscles are modeled as a single muscle that acts at an 12° angle to the spine. Suppose the person shown bends over to an angle of 30° from the horizontal. a. What is the tension in the erector muscle? Hint: Align your x-axis with the axis of the spine.b. A force from the pelvic girdle acts on the base of the spine. What is the component of this force in the direction of the spine? (This large force is the cause of many back injuries).

B-3 Jae, whose mass is 65.0kg is standing Im from the end of a uniform diving board 8m long. The diving board is supported at point 'A' by a pin and at point B by a frictionless wedge as shown on the figure. The diving board has a mass of 100kg. Jaer A Find the magnitude and direction of the force of the supports on the board at points 'A' and B. Imk 2m 5m Apply the static equilibrium conditions to the Jae+beam system. 99+ 團 op

As a part of his daily workout routine, he lifts 10-kg dumbbells on each hand. His hands, and forearms weigh 4 kg each. If the length of each of his forearms and hands are 0.5 m, determine the force exerted by his muscles? Assume that the center of gravity of the, forearms are in the middle. Complete solution with explanation please

11. Find the x- and y-coordinates of the center of gravity of a 4.00-ft by 8.00-ft uniform sheet of plywood with the upper right quadrant removed as shown in Figure P8.11. Hint: The mass of any segment of the plywood sheet is proportional to the area of that segment. y (ft) 4.00 2.00 - 0+ +x (ft) 2.00 4.00 6.00 8.00 Figure P8.11

A horse stands with its front leg raised off the ground, as shown in the figure. figure. The left hind and right forelegs each support 300 lb of the total weight that is 1,000 lbs.  a) What force is exerted by the right hind leg?  b) Calculate the position of the center of gravity of the horse.

In exercise physiology studies, it is sometimes important to determine the location of a person's center of gravity. This can be done with the arrangement shown in the figure below. 2.00 m A light plank rests on two scales that read F = 380 N and F = 280 N. The scales are separated by a distance of 2.00 m. How far from the woman's feet is her center of gravity? Need Help? Read It