Multiple Choice Question Newton's law of universal gravitation
A. explains why an object falls to the ground when it is dropped
B. is an observation Sir Isaac Newton made in 1687
C. allows us to calculate how two objects will attract each other
D. is actually a theory that has been incorrectly named

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 role of lenses in microscopy?

If the area of a square has increased by a factor of 16, by how much has each side increased?