Mechanics | Relativity Answers

a ball of mass 0.1 g is suspended by a string of length 30 cm , keeping it always taut , it describes a circle of radius 15 cm . find the angular speed of the ball.

The length of a wire is a metre when the tension is 4N, Length is b metre when the tension is 5N, What is the length when the tension is 9N?

a particle is thrown at some angle with x-axis with speed "u". After 1 second its velocity makes 45 degree with X-axis. After 2 second particle is at its maximum height. Find angle of projection?

a crickt bal z thrown at an angle 30degre with verticle at a sped of 10m/s.calcult the max.height,range n time taken to come the same lavel

A body travelling with constant retardation travels 250 metres in 10 seconds and next 250 metres in next 20 seconds. Find the retardation.

A plank of mass 5 kg and length 3 meters is resting horizontally on two trestles P and Q which are a distance of 2.5 meter apart.When a student of mass 60 kg walks along the plank from one trestle to other, the plank sags.
Calculate the downward force exerted on each trestle when the student is a distance of 5 meters from the trestle

The acceleration of a particle is defined by the acceleration of a particle is defined by the relation a= kt^2.(a) knowing that v= -10 m/s when t= 0 and that v=10m/s when t=2s.(b) determine the constant k. write the equations of motion, knowing also that x=0 when t=2s.

when a person jumps from a moving train he falls down if he doesn't runs in the direction of motion of train. why?

a force of 200N is applied to a 50kg mass in the direction of motion for a distance of 6m and then the force is increased to 300N for the next 5m , for the 11m of travel, how much work is done by varying the force?

find the distance covered bt the bullet which is shot by a gun with an acceleration of 8 and with a velocity of 600 taking the gravity 10?