Agrindstone in the shape of solid disk with diameter 0.42 m and a mass of 50.0 kg is rotating at 750.0 rev/min. you press an axe against the rim with a normal force of 160 n and the grindstone comes to rest in 7.8 seconds. find the coefficient of kinetic friction between the axe and the grindstone. there is negligible friction in the bearings.

Arock collection comes from which part of earth?

If an inclined plane is 5 m long and 2 m high, what is its mechanical advantage? a. 2.5 b. 3 c. 7 d. 10

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.