una lancha demora 1.5 horas en llegar a una isla con una velocidad de 80km/hr¿que velocidad tendra que alcanzar para tardar 48 minutos?

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 difference between a red shift and a blue shift has to do with wavelength frequency. t or f

In which of the following is positive work done by a person on a suitcase