Assume that during each pulse a mammalian heart accelerates 21 g of blood from 18 cm/s to 28 cm/s during a time interval of 0.10 s. Calculate the magnitude of the force 9in newtons) exerted by the heart muscle on the blood.

Question

anonymous · Answer

Here's what I did:

Fnet = mvf - mvi
          ----------
                 t
       = 0. 021 kg (28 cm/s) - 0.021 kg (18 cm/s)
         -------------------------------------
                                0.10 s
= 2.1 N 

But the answer is 2.1 x 10^-2 N

anonymous · Answer

try change the cm to m first