Auniform disk, such as a record turntable, turns at 5.0 rev/s around a frictionless spindle. a nonrotating rod, of the same mass as the disk and length equal to the disk's diameter, is dropped onto the freely spinning disk. they then both turn around the spindle with their centers superposed. what is the angular velocity in rev/s of the combination?

Explanation:

The motion has two steps so is going to be before and after analysis

Before:

After:

Angular momentum is conserved

measuring things 1 litre of water

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.