Question

b.) What mass should be suspended from the end of a steel wire of
length 3m and diameter 2mm to increase the length by 1.5mm?​

Answer 1

Explanation:

Conservation of Momentum

The momentum of a system is constant

if there is no external force acting on the system. For a collision occurring between two objects in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.

What is Law of Conservation of Momentum?

Law of conservation of momentum states that

For two or more bodies in an isolated

system acting upon each other, their total momentum remains constant unless an external force is applied. Therefore, momentum can neither be created nor destroyed.

The law of conservation of momentum is an important consequence of Newton's

third law of motion.

Derivation of Conservation of Momentum

Consider two colliding particles A and

B whose masses are m1 and m2 with initial and final velocities as u1 and v1 of A and u2 and v2 of B. The time of contact between two particles is given as t.

A=m1(v1-u1) (change in momentum of

particle A)

B=m2(v2-u2) (change in momentum of particle B)

FBA=-FAB (from third law of motion)

FBA=m2*a2=m2(v2-u2)t FAB=m1*a1=m1(v 1-u1)t m2(v2-u2)t=-m1(v1-ul)t mlul+m2u

hope it helps