A star has a surface area of 6.49x1018 m2. How much power does it radiate if it has a surface temperature of 6,225 K? Submit your answer in exponential form.
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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.

The air that we breath is made mostly of which gaseous molecule

Provides most of the energy used in the world today. question 4 options: wind fossil fuel moving water sunlight