an empty large box of mass (20+0.01)kg , when a man sits inside the box , the mass of the box and the man together become (0.1+0.001)

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 force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?

Describe cytokinesis in plants and animals. in animals: in plants.