Basic Science T...

The initial velocity of a particle is u (at t  = 0 ) and the acceleration a is given by $at^{1/2}$ Which of the following  relation is valid ?

A particle of mass 40 g is moving in a circular orbit of radius 50 cm with frequengy 300 rpm. The work done in in increasing its frequency to 600 rpm is :

An object measures $3 \ cm$ by $9 \ cm$ by $4 \ cm$ and weighs $54 \ grams$. If another object made from the same material measures $6 \ cm$ by $2 \ cm$ and $3 \ cm$, what would be the weight of the second object in terms of the first object?

What is the moment of inertia of ring about its diameter?

A stone is projected horizontally with a velocity 9.8 m/s from a tower of height 100m. Its velocity one second after projection is

Two discs have the same mass and thickness. Their materials are of densities $d_1$ and $d_2.$ The ratio of their moment of inertia about the central axis will be:

If uncertainty in the measurement of position and momentum are equal . What is uncertainty in the measurement of velocity 

A 1 kg particle strikes a wall with velocity 1 m/s at an angle $30^{\circ}$ and reflects at the same angle. If it remains in contact with wall for 0.1 s, then the force is 

An object moving horizontally with kinetic energy  of 800 J experiences a constant opposing force of 100 N while moving  from a  to b (where ab  = 2m ) . The energy of particle at  is :

A wheel of moment of inertial $2 Kg m^2$ is rotating about an axis passing through centre and perpendicular to its plane at a speed 60 rad/s. Due to friction, it comes to rest in 5 minutes. The angular momentum of the wheel three minutes before it stops rotating is