High-speed photos of a 190 g flea jumping vertically show that the jump lasts 1.

Question

High-speed photos of a 190 g flea jumping vertically show that the jump lasts 1.3 ms and involves an average vertical acceleration of 110 g .

What average force does the ground exert on the flea during its jump?Express your answer to two significant figures and include the appropriate units.

What impulse does the ground exert on the flea during its jump?Express your answer to two significant figures and include the appropriate units.

What's the change in the flea's momentum during its jump?Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

mass of flea, m=190*10^-6 g = 190*10^-9 kg

time laps, t=1.3*10^-3 sec

acceleration, a=110*g = 110*9.8=1078 m/sec^2

1)

force, F=m*a

=190*10^-9*1078

=2.05*10^-4 N

2)

impulse, J=F*t

J=(2.05*10^-4*1.3*10^-3)

J=2.66*10^-7 N.sec

3)

change in momentum dP=J

dp=2.66*10^-7 N.sec

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