An optical instrument consists of two lenses. If the object lens distance for lens 1 is 12cm the the image distance is 36cm. If the height of the object for 2 lens is 5cm then the image height is 2.5 cm. Evaluate the combined magnification of the two lenses.

Two particles of masses m and 2m are placed on a smooth horizontal table. a string, which joins these two masses, hangs over the edge supporting a pulley, which suspends a particle of mass 3m.the pulley has negligible mass. the two parts of the string on the table are parallel and perpendicular to the edge of the table. the hanging parts of the string are vertical. find the acceleration of the particle of mass 3m.

How will the system respond to a temperature increase?

What determines the amount of inertia an object has