Problem 17E

Ball bearings can be made by letting spherical drops of molten metal fall inside a tall tower—called a shot tower—and solidify as they fall.

a. If a bearing needs 4.0 s to solidify enough for impact, how high must the tower be?

b. What is the bearing’s impact velocity?

Solution 17E

Part (a)

Step 1 of 3:

The ball bearings fall inside a shot tower with zero initial speed. We are going to find the height of the shot tower required to land them in 4 s.

The initial speed vis = 0

The time taken by the ball Δt = 4 s

The acceleration due to gravity g = 9.8 m/s2

The final height at the ground y0 = 0

The initial height = y