The portable work platform is elevated by means of the two hydraulic cylinders articulated at points c. the pressure in each cylinder produces a force f. the platform, man, and load have a combined mass m, and the mass of the linkage is small and may be neglected. determine the upward acceleration a of the platform. use the values f = 4.2 kn, m = 187 kg, b = 1.24 m, and θ = 38°.

What is work? how much work is done to move an object 0 meters?

Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle α with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamilton’s equations (canonical equations) of motion.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?