Question

According to a simplified model of a mammalian heart, at each pulse approximately 20 g

of blood is accelerated from 0.26 m/s
to 0.36 m/s
during a period of 0.09 s
What is the magnitude of the force exerted by the heart muscle?

Answer 1

Force exerted by heart muscle on blood = 2/9 Newton

Step-by-step explanation:

Blood flow's initial speed = 0.26 m/s

Blood flow's final speed = 0.36 m/s

time = 0.09s

Mass of blood = 20 g

Force exerted on blood = To find.

We know that, Force = mass*acceleration

We know acceleration is the rate of change of velocity with time,mathematically, a = Final velocity (v) - Inituial velocity(u)/ time( t) = v-u/t

Putting the values given.

• 0.36-0.26/0.09 = acceleration
• 0.1 / 0.09
• 10/9 m/s^2

Hence force = m*a as stated above

F = 10/9*20/100

F = 2/9 N