Which statements describe intensity? check all that apply.
intensity is the amount of energy that flows in an area per unit of time.
intensity is the number of wavelengths that flow in an area per unit of time.
intensity that is lower than or equal to 85 units can harm human hearing.
intensity that is greater than or equal to 85 units can harm human hearing.
intensity is measured in decibels.
intensity is measured in hertz.
(a, d, e) your welcome)

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 is the equation for electrical work?

Which additional product balances the reaction h2so4 + 2naoh → na2so4 + 2h2o 2oh h2o2 h3o