When light from a source is sent through a gas. i. certain wavelengths are absorbed. ii. a dark line is left. Which of the following is/are correct?

If \(\theta\) is equal to \(\alpha\) at the time the box is just about to slide down the plank, the coefficient of static friction between the plank and box is

a pilot records the atmospheric pressure outside his plane as 63cm of Hg while a ground observer records a reading of 75cm of Hg with his barometer. Assuming...

As the end Q of the plank is raised, the component of W, normal to plank, will

A rectangular block of wood floats in water with two-thirds of its volume immersed. When placed in another liquid, it floats with half of its volume immersed...

I the box is pulled from P to Q, which of the following expresses the velocity ratio of the inclined plane?

which of the following pairs of physical quantities comprises vectors?

The term torque means

A piece of stone attached to one end pf string is whirled round in a horizontal circle. When the string is suddenly cut, the stone will