Which of these best describes air pressure? a
amount of pressure exerted by dust particles in the atmosphere
b
amount of pressure exerted in the air caused by gravity and matter moving on all objects
c
amount of pressure caused by volcanoes and wildfires in the atmosphere
d
amount of pressure in the atmosphere due to the movement of earth

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.

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

An open cart is moving along a straight frictionless horizontal track. when rain starts falling vertically into the cart, what happens to the speed of the cart?