Question

During one heartbeat about 0.06 kg of blood is accelerated from rest to a velocity of 1m/s
upward in a time 0.1s. What is the force creating this movement?
a) 10 N
b) 1 N
c) 0.6 N
d) 0.06 N
e) 0.1 N

Answer 1

Answer on Question #41016, Physics, Mechanics

During one heartbeat about 0.06 kg of blood is accelerated from rest to a velocity of 1 m/s upward in a time 0.1 s. What is the force creating this movement?

a) 10 N

b) 1 N

c) 0.6 N

d) 0.06 N

e) 0.1 N

Solution:

Given:

$$m = 0.06 \, kg,$$ $$v_i = 0 \text{ is the initial velocity},$$ $$v_f = 1 \, \text{m/s} \text{ is the final velocity},$$ $$t = 0.1 \, \text{s},$$ $$F = ?$$

The force is

$$F = m a$$

where $a$ is the acceleration.

The equation for acceleration is

$$a = \frac{v_f - v_i}{t} = \frac{1}{0.1} = 10 \, \text{m/s}^2$$

Thus,

$$F = 0.06 \cdot 10 = 0.6 \, \text{N}$$

Answer. c) 0.6 N