## A Numerical Problem from Mechanics

A rock explodes and is split into three pieces. two of them moves in direction of perpendicular to each other. One piece of mass 1kg moves with velocity of 5m/s and second piece of mass 2kg moves with velocity of 13m/s. find mass of third piece. (Tayade Kishore S asked)   Incoming search terms:numerical problems [...]

## Example for rotation and translation together

“Please explain me motion of rigid body having both motion i.e translatory and  rotational. Please explain me logically” – Anoop Asked Answer: When a ball spins at the same place, it is in rotation When the ball is rolling on the ground, it is having translatory motion as well as rotational motion. Incoming search terms:physics from rotation to [...]

## A Numerical from kinematics

when a obj. crosses a 5m mark below the top of a building….a 2nd object is released at tat time which is 25m below the top…n den they reach the ground simultaneously…wat is the height of the building??????(

## Numericals from Kinematics

PHYSICS TEST (CLASS XI) Kinematics

1. A particle is projected at 60º to the horizontal with a kinetic energy K. What is the kinetic energy at the highest point
2. Which of the following statements is false for a particle moving in a circle with a constant angular speed?
(a) the velocity vector is tangent to the circle
(b) the acceleration vector is tangent to the circle
(c) the acceleration vector points to the centre of the circle
(d) the velocity and acceleration vectors are perpendicular to each other
3. A car is moving in a circular horizontal track of radius 10.0 m with a constant speed of 10.0m/s.A plumb bomb is suspended from the roof of the car by a light rigid rod of length1.00m. What is the angle made by the rod with the track is (g= 10 m/s²)
4. The distance traveled by an object along the axes are given by x=2t², y = t² – 4, z = 3 t – 5. What is the initial velocity of the particle
5. A boy playing o the roof of 10m high building throws a ball with a speed of 10 m/s at an angle of 30º the horizontal. How far from the throwing point will the ball be at the height of 10m from the ground?
6. If a body travels half of its path in the last second of its fall from rest; find the time and height of its fall?
7. An object A is kept fixed at the point x = 3m and y=1.25m on a moving along the +x direction with an acceleration 1.5 m/s. At the same instant a stone hitting the object during its downward motion at an angle pf 45º to the horizontal .all the motions are in X-Y plane .Find u and time after which stone hits the object. Take g = 10m/s²
8. Three particles a, b and c are situated at the vertices of an equilateral triangle ABC of side d at t=0. Each of the particles moves with constant speed v. A always has its velocity along BC and C along CA. At what time will the particles meet each other?
9. A man standing on road has to hold his umbrella at 30º with the vertical to keep the rain away he throws the umbrella and starts running at 10 km/h. he finds that  raindrops with respect to [a]the road, [b] the moving man.

10. A man can swim at speed of 3 km/h in still water. He wants to cross a 500 m wide river flowing at 2 km/h. he keeps himself always at an angle of 120º with the