A solid disk of mass m1 = 9.4 kg and radius R = 0.25 m is rotating with a constant angular velocity of ω = 36 rad/s. A thin rectangular rod with mass m2 = 3.1 kg and length L = 2R = 0.5 m begins at rest above the disk and is dropped on the disk where it begins to spin with the disk. 1)What is the initial angular momentum of the rod and disk system? kg-m2/s 2)What is the initial rotational energy of the rod and disk system? J 3)What is the final angular velocity of the disk?

scientific laws are the result of testing theories and proving them to be facts.

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

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.