Wire A and wire B are made from the same material and are under the same tension, but waves travel along string B at one-third the wave speed of string A. The radius of wire A is 0.100 mm. What is the radius of wire B

0.3 mm

Explanation:

= Density of material

= Linear density of the material =

Area = Area =

r = Radius

The velocity of a wave is given by

It can be seen that the velocity is inversly proportional to the radius

So,

From the question

The radius of wire B is 0.3 mm

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be