Linda Seales

Answered

2022-01-10

Fleas have remarkable ability to jump. A 0.40 mg flea, jumping straight up, would reach a height of 35 cm if there were no air resistance. In reality, air resistance limits the height to 20 cm.

a) What is the fleas

Answer & Explanation

Mary Goodson

Expert

2022-01-11Added 37 answers

Given:

mass, $m=0.4mg=0.4\times {10}^{-6}\text{}kg$

maximum height reached, h = 35 cm = 0.35 m

Formula used:

The kinetic energy is equal to

$K=0.5m{v}^{2}$

The potential energy can be expressed as

$U=m\times g\times h$

mass, $m=0.4mg=0.4\times {10}^{-6}\text{}kg$

maximum height reached, h = 35 cm = 0.35 m

(a) Let K is the kientic enregy as it leave the ground. BY use of conservation of energy, the potential energy at teh top is equal to the kientic energy at the ground.

The potential energy at the top, $U=0.4\times {10}^{-6}\times 9.8\times 0.35=1.37\times {10}^{-6}\text{}J$

So, the kinetic energy as it leaves the ground is $1.37\times {10}^{-6}\text{}J$.

(b) The potentai energy at the top is $1.37\times {10}^{-6}\text{}J$.

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