The two children shown in the figure below are balanced on a seesaw of negligible mass. The first child has a mass of 23.3 kg and sits 1.39 m from the pivot. The second child has a mass of 31.7 kg and sits 1.02 m from the pivot. Use the second condition for equilibrium (net z = 0) to calculate F, the supporting force (in N) exerted by the pivot. (Enter the magnitude.) F, m2 m w W2

The large quadriceps muscle in the upper leg terminates at its lower end in a tendon attached to the upper end of the tibia (see Figure a). The forces on the lower leg when the leg is extended are modeled as in Figure b, where T is the force of tension in the tendon, w is the force of gravity acting on the lower leg, and F is the force of gravity acting on the foot. Find T when the tendon is at an angle of 25.0° with the tibia, assuming that w = 29.O N, F = 12.3 N, and the leg is extended at an angle 6 of 40.0° with the vertical. Assume that the center of gravity of the lower leg is at its center and that the tendon attaches to the lower leg at a point one-fifth of the way down the leg. (Give the magnitude.) Quadriceps - Tendon Tibia 25.0°7

A 14.0 m uniform ladder weighing 480N rests against a frictionless wall. The ladder makes a 61.0°-angle with the horizontal. (a) Find the horizontal and vertical forces (in N) the ground exerts on the base of the ladder when an 830-N firefighter has climbed 4.10 m along the ladder from the bottom. horizontal force magnitude 483 It may be helpful to think first about the force the wall exerts on the ladder. How is this related to the force that the ground exerts on the ladder?N direction towards the wall vertical force magnitude 1310 direction up (b) If the ladder is just on the verge of slipping when the firefighter is 9.30 m from the bottom, what is the coefficient of static friction between ladder and ground? 0.604 It may be helpful to think first about the force the wall exerts on the ladder. How is this related to the force that the ground exerts on the ladder? (c) What If? If oil is spilled on the ground, causing the coefficient of static friction to drop to half the value found…

A house painter stands 3.00 m above the ground on a 5.00-m-long ladder that leans against the wall at a point 4.70 m above the ground. The painter weighs (6.60x10^2) N and the ladder weighs (1.900x10^2) N. Assuming no friction between the house and the upper end of the ladder, find the force of friction, in units of N, that the driveway exerts on the bottom of the ladder. Give your answer with three significant figures.

A person with mass 55.0 kg stands d= 1.60 m away from the wall on a x = 5.65 m beam, as shown in the figure below. The mass of the beam is 40.0 kg. Find the hinge force components and the tension in the wire. (Indicate the direction with the sign of your answer.) 옷 d X 30°

In the figure, one end of a uniform beam of weight 240 N is hinged to a wall; the other end is supported by a wire that makes angles θ = 26° with both wall and beam. Find (a) the tension in the wire and the (b) horizontal and (c) vertical components of the force of the hinge on the beam.

A non-uniform beam has a length of 4.74 m and a mass of 63.7 kg. The beam is resting horizontally on two supports. The first support is located 1.31 m from the left edge of the beam and applies an upward force of 199 N to the beam. The second support is located 1.86 m to the right of the first support. How much upward force is applied on the beam by the second support?

A short cantilever beam is subjected to three forces. If α = 45°, determine the value of F in kN that will make the magnitude of the resultant of the three forces smallest as shown in the figure. Take F1 = 70 kN and F2 = 25 kN.

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The figure below shows a beam of uniform density with a mass of 33.0 kg and a length l = 4.45 m. It is suspended from a cord at a distance d = 1.20 m from its left end, while its right end is supported by a vertical column. (a) What is the tension (in N) in the cord? N (b) What is the magnitude of the force (in N) that the column exerts on the right end of the beam? N Need Help? Read It