Question

the bob of a simple pendulum is imparted a velocity of 4m/s at its mean position. calculate the maximum vertical height reached by the pendulum in its extreme position when (a) there is no loss of energy (b) there is a 50% loss of energy due to air friction

Answer 1

Answer:

When it is at mean position it will have a K.E of 0.5mv

2

.

K.E=0.5×m×5×5=12.5×m J

60 % of this K.E is lost hence remaining is equal to (40/100)12.5×m=5m

P.E=mgh=5×m

h=5/g=5/10=0.5m

Hence it goes to a height of 0.5m.