Physics Answers

A box of mass 20 kg is kept on a smooth horizontal surface. Another object of mass 16 kilogram is kept on the box. The two objects are connected by a light inextensible string and the string goes over a smooth pulley. If a force of 6 Newtons is applied on the box, find the acceleration of the box.

How may revolutions per minute must the body make about vertical axis so that the cord make an angle of 45 with the vertical

Suppose we experiment with an Atwood Machine consisting of two masses m

and 2m connected by an inextensible non-slip string running over a pulley of

radius a and mass 4m, as shown below.

) Briefly discuss why no work is done by the forces of constraint. (5)

(d) What is the total energy of the system? (2)

(e) Find the acceleration dv/dt of the blocks.

Suppose we experiment with an Atwood Machine consisting of two masses m

and 2m connected by an inextensible non-slip string running over a pulley of

radius a and mass 4m, as shown below.

(a) Determine the total kinetic energy of the system. (6)

(b) Find the gravitational potential energy of the system.

A harmonic oscillator has a mass of 0.20kg and unknown spring constant,if the period is T=20g find k

A harmonic oscillator has a mass of 0•20kg,an unknown spring constant, if the period is T=20. Find k

Matt is watching a jet take off when he hears the engine roar with an intensity of 100 W/m^2. At what minimum distance should Matt be, in order for him to not hear the jet?

An inclined plane is 100 m long and at an angle of 20 degrees * 10 * k * epsilon horizontal. The A*Lambda of the slope is two. Calculate: a) the effort required to push a 7200 N block up the slope b) the ideal mechanical advantage

c) the efficiency of the slope.

An inclined plane is 100 m long and at an angle of 20 degrees to the

horizontal. The AMA of the slope is two. Calculate:

a) the effort required to push a 72 underline C N block up the slope b) the ideal mechanical advantage c) the efficiency of the slope.

starting from maxwell's equations derive wave equation for a uniform plane wave travelling in free space.