Describe the main difference between an element and a compound. Be sure to include the following ideas: pure substance, combinations, and chemical bonds.

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.

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)