For each scenario below, indicate whether a chemical reaction or a nuclear reaction is occurring. a. When two compounds are combined heat is released.
b. A sample of galium-68 is reduced to one-half of its original amount in 68.3 minutes.
c. Radium-226 decays to radon-222.
d. A spark of energy is used to begin the combustion of methane gas.
e. Hydrogen nuclei are fused in the Sun to make helium atoms

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

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.

What happens when a rubber rod is rubbed with a piece of fur?