Working with pressure and viscous flow.

A cylinder is fitted with a piston, beneath which is a spring. The cylinder is open at the top. Friction is absent. The spring constant of the spring is 3600 N/m. The piston has a negligible mass and a radius of 0.025 m. (a) When air beneath the piston is completely pumped out, how much does the atmospheric pressure cause the spring to compress? (b) How much work does the atmospheric pressure do in compressing the spring?

angular momentum

A .015 kg coin of diameter .013 m is spinning at 9 rev/s about a vertical diameter at a fixed point on a tabletop. a) If the coin spins about a vertical diameter at 9 rev/s while its center of mass travels in a straight line across the tabletop at .05 m/s, what is the angular momentum of the coin about a point on the line of motion? b)what is the angular momentum of the coin about a point .1 m from the line of motion?(there are two answers to this question)

Static Equilibrium

The system in figure 13-45 is in equilibrium. A mass of 225 kg hangs from the end of the uniform strut. The tension T in the supporting cable is measured to be 6,910 N. a) What is the mass of the strut? b) What is the vertical component of the force exerted on the strut by the hinge? c) What is the horizontal component of the force exerted on the strut by the hinge?

Static Equilibrium

A ladder rests against a frictionless vertical wall. The coefficient of static friction between the ladder and the floor is 0.44. What is the smallest angle at which the ladder will remain stationary?

Working with static equilibrium and tension.

A scaffold of mass 35 kg and length 5.8 m is supported in a horizontal position by one vertical cable at each end. A window washer of mass 86 kg stands at a distance d from the midpoint of the scaffold. The tension in the cable nearest the worker is twice the tension in the other. a) What is the tension in the cable nearest the worker? b) What is the tension in the further cable? c) How far is the worker from the center of the scaffold?