18. The velocity v of blood that flows in a blood vessel with radius R and length l at a distancer from the central axis is v(r) 4n (R - p2) 4nl where P is the pressure difference between the ends of the vessel and n is the viscosity of the blood (see Example 2.7.7). Find the average velocity (with respect to r) over the interval 0
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
![### Calculus and Physics Applications
**Problem 17: Temperature Modeling**
In a certain city, the temperature (in °F) *t* hours after 9 AM is modeled by the function:
\[ T(t) = 50 + 14 \sin \frac{\pi t}{12} \]
**Objective:** Find the average temperature during the period from 9 AM to 9 PM.
---
**Problem 18: Blood Flow Velocity**
The velocity \( v \) of blood that flows in a blood vessel with radius \( R \) and length \( l \) at a distance \( r \) from the central axis is given by the equation:
\[ v(r) = \frac{P}{4\eta l} (R^2 - r^2) \]
where:
- \( P \) is the pressure difference between the ends of the vessel.
- \( \eta \) is the viscosity of the blood.
**Objective:** Find the average velocity (with respect to \( r \)) over the interval \( 0 \leq r \leq R \) and compare the average velocity with the maximum velocity.
---
**Problem 19: Linear Density of a Rod**
The linear density in a rod 8 meters long is:
\[ \frac{12}{\sqrt{x}} + 1 \, \text{kg/m} \]
where \( x \) is measured in meters from one end of the rod.
**Objective:** Find the average density of the rod.
---
**Problem 20: Free Fall Displacement**
If a freely falling body starts from rest, then its displacement is given by:
\[ s = \frac{1}{2} gt^2 \]
**Objective:** Examine the velocity after a time \( T \) being \( v_T \), and show that computing the average of the velocities with respect to \( t \) results in \( v_{\text{ave}} = \frac{1}{2} v_T \).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff2195755-482e-43b2-9535-9be7e3b0c44a%2Fe95f2ef5-9cca-4b26-bfd1-34c824a12a13%2F3bioszm_processed.jpeg&w=3840&q=75)
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