# Application: Blood is accelerated from rest to 30.0 cm/s ## Problem 26PE Chapter 2

Physics: Principles with Applications | 6th Edition

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Problem 26PE

Application: Blood is accelerated from rest to 30.0 cm/s in a distance of 1.80 cm by the left ventricle of the heart. (a) Make a sketch of the situation. (b) List the knowns in this problem. (c) How long does the acceleration take? To solve this part, first identify the unknown, and then discuss how you chose the appropriate equation to solve for it. After choosing the equation, show your steps in solving for the unknown, checking your units. (d) Is the answer reasonable when compared with the time for a heartbeat?

Step-by-Step Solution:

Step-by-step solution Step 1 of 8 (a) The sketch of the accelerated motion of the blood is, Here, is initial position of the blood, u is initial velocity of the blood and a is acceleration of the blood. Step 2 of 8 (b) Blood is accelerated from rest, so its initial velocity u is zero and its final velocity v is 30.0 cm/s. The distance s, which is the difference between its final position and initial position, is 1.80 cm. Comment Step 3 of 8 Hence, the known quantities are initial velocity, final velocity and distance. Comment Step 4 of 8 (c) The equation for the kinematics is, Also, Here is the final speed, is the initial speed, is the acceleration and is the time. Comment

Step 5 of 8

Step 6 of 8

##### ISBN: 9780130606204

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