A box of negligible mass rests at the left end of a 2.00 m, 29.0 kg plank (Eigure 1). The width of the box is 75.0 cm, and sand is to be distributed uniformly throughout it. The center of gravity of the nonuniform plank is 50.0 cm from the right end Figure Sandbox- -75.0 cm A < 1 of 1 Center of gravity of plank 50.0 cm > ▼ Part A What mass of sand should be put into the box so that the plank balances horizontally on a fulcrum placed just below its midpoint? Express your answer with the appropriate units. msand F Submit μA Value Request Answer Units s Review | Constants ?

The beam is made of an elastic-plastic material for which σYσYsigma_Y = 70 MPaMPa . The largest moment in the beam occurs within the center section a-a. Determine the magnitude of each force PP that causes this moment to be the largest elastic moment. Determine the magnitude of each force PP that causes this moment to be the largest plastic moment.

Q9

A 6-m long ladder has a mass of 1Q kg, and its center of gravity is 2.4 m from the bottom along the ladder. The ladder is resting on a 5° upward sloping floor at A and on a wall inclined to the right at 5° from the vertical at B, so that it makes an angle of 60° with the horizontal.How far up along the ladder can a 7T-kg man climb before the ladder is on the verge of slipping? The angleof friction at all contact surfaces is 15°. Also determine the total reaction at A and B in Newton. Note: Point A is at the left of point B. Where: Q=2 T=6

11-30 Two blocks are suspended on a continuous inex- tensible cord as shown in Fig. P11-30. Determine the angle O for equilibrium if the masses of blocks A and B are 50 and 40 kg, respectively. Fig. P11-30