One major concern of acid rain is that it can - A. change the pH of soil and lakes
B. burn holes in the skin of humans and animals
C. it makes vegetation grow out of control
D. it turns trees red

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.

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

2) why do satelites not fall while revolving around the earth?