PART - 1 CH - 5Work, Energy and Power — Physics STD 11 Science — Question

A particle is in linear simple harmonic motion between two points, A and B, 10cm apart. Take the direction from A to B as the positive direction and give the signs of velocity, acceleration and force on the particle when it is:

At 2cm away from B going towards A.

A mass of 2kg is attached to the spring of spring constant 50Nm^–1 . The block is pulled to a distance of 5cm from its equilibrium position at x = 0 on a horizontal frictionless surface from rest at t = 0. Write the expression for its displacement at anytime t.

Why does cotton wick keep burning in an oil filled lamp?

A constant torque of 120N-m rotates its point of action by an angle of 30°. What is the work done by the torque?

Does it matter if one uses gauge instead of absolute pressures in applying Bernoulli's equation? Explain.

Why two layers of cloth of equal thickness provide warmer covering than a single layer of cloth of double thickness?

What is the nature of force involved in the winding of a watch?

In a longitudinal wave, what is the distance between a compression and its nearest rarefraction?

What is the apparent weight of a man of mass 60kg who is standing on a lift which is moving up with a uniform speed? (g = 10ms^-2)