According to a simplified model of the mammalian heart, with each contraction, about 20 g

According to a simplified model of the mammalian heart, with each contraction, about 20 g of blood accelerates from a velocity of 0.25 m / s to 0.35 m / s in 0.2 s. The average strength is developed by the heart muscle, equal.

To find the average force that the heart muscle should develop, we use Newton’s second law: F = m * a = m * (V – V0) / t.

Values of variables: m – blood mass (m = 20 g = 0.02 kg); V is the final blood velocity (V = 0.35 m / s); V0 – initial speed (V0 = 0.25 m / s); t – elapsed time (t = 0.2 s).

Let’s make a calculation: F = m * (V – V0) / t = 0.02 * (0.35 – 0.25) / 0.2 = 0.01 N.

Answer: The mammalian heart muscle develops an average strength of 0.01 N.