A laser cavity includes two mirrors onc of them concave mirror with radius 86 cm and another one is convex with radius 1.42 m and the distance between two mirrors is 130 cm. The wavelength of this laser is 0.744 um. Show if the resonator of this laser is stable or not?

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

Write a polynomial function with the given zeros x= -1,0,2show your work

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.