10.56 Problem 10.56 Part A Fleas have remarkable jumping ability. A 0.50 mg flea

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10.56

Problem 10.56 Part A Fleas have remarkable jumping ability. A 0.50 mg flea, jumping straight up, would reach a height of 40 cm if there were no air resistance. In reality, air resistance limits the height to 20 cm What is the flea's kinetic energy as it leaves the ground'? Express your answer to two significant figures and include the appropriate units. A's 1 Value Units Submit My Answers Give Up Part B At its highest point, what fraction of the initial kinetic energy has been converted to potential energy? Express your answer using two significant figures. Submit My Answers Give Up

Explanation / Answer

(part A) . K.E. of flee when it leaves the ground = Potential Energy of flee at heighest point

K.E. = mgh = 0.5*10-3*10-3 * 10 *40*10-2 = 2* 10-6 Joule

(part B) - case 1 : if there is no air resistance

then the whole kinetic enegy will be converted into potential energy

case 2 : If there is air resistance :

in this case h = 20cm

potential energy at this point = mgh = 1* 10-6

So 50 % of initial Kinetic enegry will be converted into potential energy Fraction = 1/2

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