Your forehead can withstand a force of about 6.0 kN before fracturing, while you

Question

Your forehead can withstand a force of about 6.0 kN before fracturing, while your cheekbone can withstand only about 1.3 kN. Suppose a 140 g baseball traveling at 26 m/s strikes your head and stops in 1.8 ms .

What is the magnitude of the force that stops the baseball? Express your answer to two significant figures and include the appropriate units. F =

Part B What force does the baseball exert on your head? Express your answer to two significant figures and include the appropriate units. F =

Are you in danger of a fracture if the ball hits you in the forehead? Yes or No

Are you in danger of a fracture if the ball hits you in the forehead? yes or No

Part D

On the cheek? no OR yes

Explanation / Answer

part A) the magnitude of the force that stops the baseball is F=m(v-u)/t

here m=`140g=140*10-3kg,v=0,u=26m/s,t=1.8ms=1.8*10-3s

F=140*10-3(0-26)/1.8*10-3=-2022.22N

part B) force does the baseball exert on your head F=mv/t=140*10-3(26)/1.8*10-3=2022.22N

part c) No ,because baseball apply force on the fore head is small compared to force of forehead

part D)yes, baseball facture the cheek because force apply by the ball onthe cheek is morethan force of cheek bone

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