Pressure problem - Impulse of object striking a head

[ron360]

Pressure problem -- Impulse of object striking a head

1. A police crime lab is trying to determine whether someone was murdered or died as a result of an accident. He was struck in the temple by a 4.20 kg sculpture that is alleged to have fallen off a bookcase. The sculpture presumably fell a distance of 1.43 m and the corner that struck him had an area of 0.25 cm2. If the time for the sculpture to stop was 1.00 ms, the pressure on his temple, in N/m2, was...
2. i know pressure is : p=F/A
A(area)= 2.5*10^(-5)m^2
and the answer is p=8.88*10^(8)N/m^2

but i can't get force in any way
i know its F=ma, but whatever i try doesn't work. please help.

 

[paisiello2]

Do you know what an impulse is?

 

[ron360]

in know its change in momentum which is mv, but how would you apply to my force?

 

[paisiello2]

A force is also a change in momentum, right?

 

[ron360]

yeah but change i get is F=6.006*10^8(kg*m/s^2) and its not the actual force

 

[mfb]

Change in momentum and force have some relationship you can use (together with one of the values from the problem statement).

 

[paisiello2]

Maybe show all your work explicitly so we can find out where you are going wrong.