Physics, 30.07.2019 02:30 kaykayhodge

During each heartbeat, about 80 g of blood is pumped into the aorta in approximately 0.2 s. during this time, the blood is accelerated from rest to about 1 m/s. what is the average force on the blood during this time?

Answers: 1

Show answers

Answers

Answer from: mihir50

The average force acting on the blood as it is pumped into the aorta is $\boxed{0.4\text{ N}}$ .

Explanation:

As the blood enters the aorta, the speed of the blood increases from zero to $1\text{ m/s}$ in a time of $0.2\text{ s}$ . It means that the blood moves under the acceleration as it passes through the aorta.

The acceleration produced in a body is due to the force experienced by the particular amount of blood as it enters the aorta.

Write the expression for the acceleration of the blood as its speed increases.

$\boxed{a=\dfrac{v_{f}-v_{i}}{t}}$ ...... (1)

Here, $v_{f}$ is the final velocity of blood, $v_{i}$ is the initial velocity and is the time taken to accelerate.

Substitute the values of the velocities and the time taken by the blood in equation (1).

$a&=\dfrac{1-0}{0.2}\text{ m}\text{/s}^2}\\&=\dfrac{1}{0.2}\text{ m}\text{/s}^2}\\&=5\text{ m}\text{/s}^2}$

The net force acting on the blood is given by:

$F=m\times{a}$ ...... (2)

Substitute the values of mass and acceleration in the above expression.

$\begin{aligned}F&=80\text{ g}\left(\dfrac{1 \text{ kg}}{1000\text{ g}}\right)\times\left(5\text{ m/s}^2\right)\\&=0.08\times5\text{ N}\\&=0.4\text{ N}\end{aligned}$

Therefore, the average force acting on the blood as it is pumped into the aorta is $\boxed{0.4\text{ N}}$ .

Learn More:

1. what type of mirror do dentist use link

2. forces of attraction limit the motion of particles most in link

3. how long to walk 2000 miles link

Answer Details:

Grade: High School

Subject: Physics

Chapter: Force and acceleration

Keywords:

heartbeat, average force, aorta, blood, rest, speed up, acceleration, initial speed, final speed, time, accelerated, 80 g, blood is pumped.

Answer from: Quest

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Other questions on the subject: Physics

Physics, 22.06.2019 11:40, johanperezpere51

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?

Answers: 3

continue

Physics, 22.06.2019 14:20, mercymain1014

How many atoms of nitrogen are in the chemical formula ni(w on

Answers: 1

continue

Physics, 22.06.2019 16:40, scully1442

Acapacitor is storing energy of 3 joules with a voltage of 50 volts across its terminals. a second identical capacitor of the same value is storing energy of 1 joule. what is the voltage across the terminals of the second capacitor?

Answers: 3

continue

Physics, 22.06.2019 18:00, championroof

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

Answers: 1

continue

You know the right answer?

During each heartbeat, about 80 g of blood is pumped into the aorta in approximately 0.2 s. during t...