Phy 1010 Chapter 5 Activity: Swinging Bowling Ball A bowling ball is suspended f
ID: 3307979 • Letter: P
Question
Phy 1010 Chapter 5 Activity: Swinging Bowling Ball A bowling ball is suspended from the ceiling of a lecture hall by a strong cord. The ball is drawn away from its equilibrium position and released from rest at the tip of the demonstrator's nose, as shown in the figure below. (a) If the demonstrator remains stationary, explain why the ball does not strike her on its return swing. (b) Would this demonstration be safe if the ball were given a push from its starting position at her nose? Why, or why not?Explanation / Answer
a] It is because of conservation of energy. When it returns it rises to same height only, i.e. because initial potential energy has to be same as final potential energy given that kinetic energy is zero initially as well as finally.
b] It will not be same.
Because on returning, final hight will be more than initial, so will strike the demostrator. Height will be more because of conservation of energy
PEf = KEi + PEi
mgh2 = 0.5mv^2 + mgh1
h2 = h1 + 0.5 v^2/g