Problem 10.56 Part A jumping ability A 0 40 mg flea, jumping straght up, would r

Question

Problem 10.56 Part A jumping ability A 0 40 mg flea, jumping straght up, would reach a height of 40 em if there were no air resistance In reality, air resistance limits the height to 20 em What is the flea's kinetic energy as it leaves the ground? Express your answer to two significant figures and include the appropriate units. ax.10 K Value Units X Incorrect; Try Again; 4 attempts remaining Your answer does not have the correct dimensions Part B At its highest point, what fraction of the instial konetic energy has been converted to potential energy?

Explanation / Answer

Part A -

m = 0.40 mg = 0.40 x 10^-3 kg

h = 40 cm = 0.40 m

Kinetic energy of the flea's when it leaves the ground = potential energy at a height of h meter

= m*g*h = 0.40 x 10^-3 x 9.8 x 0.40

= 1.568 x 10^-3 J = 1.6 x 10^-3 J

Part B -

At the heighest point, total kinetic energy is converted into the potential energy.

So, fraction of kinetic energy converted into potential energy = 1.0

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