1. minerals are naturally occurring, substances with a fixed crystal structure and a unique chemical composition.
2. processing ore sometimes involves or grinding minerals.
3. prehistoric people used for knives and arrowheads.
4. the average american house contains about pounds of minerals.
5. early used rocks as simple tools as early as 2.6 million years ago.

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.

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm

An automobile steering wheel is shown. what is the ideal mechanical advantage? if the ama is 8, what is the efficiency of the steering wheel?