Physics Test 19...

A car of mass 1000 kg moves on a circular road with a speed of 20 m/s. Its direction changes by 90° after travelling 628 m on the road. The centripetal force acting on the car is

A pendulum bob is released from horizontal position shown. At an angular position θ, its total acceleration makes an angle ϕ with string, ϕ is -

A ball of mass m is released from A inside a smooth wedge of mass m as shown in the figure. What is the speed of the wedge when the ball reaches point B?

A light particle moving horizontally with a speed of 12 m/s strikes a very heavy block moving in the same direction at 10 m/s. The collision is one dimensional and elastic. After the collision, the particle will

A particle A suffers an oblique elastic collision with a particle B that is at rest initially. If their masses are the same, then, after the collision :

A space vehicle of mass 200 kg is observed at t = 0 to pass through the origin of reference frame oxyz with velocity  relative to the frame. Due to explosive charges, the vehicle separates into three parts A, B and C of mass 100 kg, 60 kg and 40 kg respectively. At t = 2s the positions of parts A and B are observed to be at A (500, – 200, 250) and B (250, 0, – 100), where the coordinates are expressed in metres. The position of part C at that time is

Figure shows three coplanar forces acting on an object which does not have any other forces acting on it. Marks the correct options.

Figure below shows the variation of the moment of inertia of a uniform rod about an axis normal to its length with the distance of the axis from the end of the rod. The moment of inertia of the rod about an axis passing through its centre and perpendicular to the its length is

A semi-circular disc of radius 1 m and mass = 4 kg is lying on the horizontal x-y plane. If XX' is the axis of rotation of the body and a  is applied at point P, the magnitude of angular acceleration is equal to (the region is gravity free)

A uniform disk, a thin hoop (ring), and a uniform sphere, all with the same mass and same outer radius, are each free to rotate about a fixed axis through its center. Assume the hoop is connected to the rotation axis by light spokes. With the objects starting from rest, identical forces are simultaneously applied to the rims, as shown. Rank the objects according to their angular momentum after a given time t, least to greatest.