Asimple pendulum with length l is swinging freely with
smallangular amplitude. as the pendulum passes its central
(orequilibrium) position, its cord is suddenly and rigidly clamped
atits midpoint. in terms of the original period t of thependulum,
what will the new period be?

What is hidden during a lunar eclipse? isn't the moon hidden?

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge