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Employ the multiple-application Simpson's rule to evaluate the vertical distance traveled by a rocket if the vertical velocity is given by $$\begin{array}{ll} v=11 t^{2}-5 t & 0 \leq t \leq 10 \\ v=1100-5 t & 10 \leq t \leq 20 \\ v=50 t+2(t-20)^{2} & 20 \leq t \leq 30 \end{array}$$ In addition, use numerical differentiation to develop graphs of the acceleration \((d v / d t)\) and the jerk \(\left(d^{2} v / d t^{2}\right)\) versus time for \(t=0\) to 30\. Note that the jerk is very important because it is highly correlated with injuries such as whiplash.

Short Answer

Expert verified
Using multiple-application Simpson's rule, we calculate the vertical distance traveled for each of the three intervals of the given vertical velocity function \(v(t)\). Then, we find the first derivative (acceleration) and second derivative (jerk) of \(v(t)\) for each interval: 1. For \(0 \leq t \leq 10\), \(v(t) = 11t^2 - 5t\), \(a(t) = 22t - 5\), and \(j(t) = 22\). 2. For \(10 \leq t \leq 20\), \(v(t) = 1100 - 5t\), \(a(t) = -5\), and \(j(t) = 0\). 3. For \(20 \leq t \leq 30\), \(v(t) = 50t + 2(t-20)^2\), \(a(t) = 50 + 4(t-20)\), and \(j(t) = 4\). After plotting the acceleration and jerk functions, we can analyze the rocket's motion and assess risks associated with injuries such as whiplash based on the changes in acceleration and jerk over time.

Step by step solution

01

Calculate Vertical Distance using Simpson's Rule

Divide the given intervals into sub-intervals and use Simpson's rule to find the vertical distance traveled for each interval. First, for the interval \(0 \leq t \leq 10\), we have \(v(t) = 11t^2 - 5t\). We can represent the integral as: $$S = \int_0^{10} (11t^2 - 5t) dt$$ To evaluate this integral using Simpson's rule, choose an even number of intervals (n). In this case, we select \(n = 10\). The width of each sub-interval will be: $$\Delta t = \frac{10-0}{10} = 1$$ Now, we can evaluate the integral using Simpson's rule: $$S \approx \frac{\Delta t}{3} [f(0) + 4\sum_{i=1}^{n/2} f(2i-1) + 2\sum_{i=1}^{n/2-1} f(2i) + f(10)]$$ where \(f(t) = 11t^2 - 5t\). Similarly, evaluate the integrals for the other two intervals (\(10 \leq t \leq 20\) and \(20 \leq t \leq 30\)).
02

Calculate the Acceleration

To calculate the acceleration, find the first derivative of the vertical velocity function for each interval: 1. For \(0 \leq t \leq 10\), \(v(t) = 11t^2 - 5t\), find \(\frac{dv}{dt} = 22t - 5\). 2. For \(10 \leq t \leq 20\), \(v(t) = 1100 - 5t\), find \(\frac{dv}{dt} = -5\). 3. For \(20 \leq t \leq 30\), \(v(t) = 50t + 2(t-20)^2\), find \(\frac{dv}{dt} = 50 + 4(t-20)\). Now we have the acceleration function for each interval of time.
03

Calculate the Jerk

To calculate the jerk, find the second derivative of the vertical velocity function for each interval: 1. For \(0 \leq t \leq 10\), \(v(t) = 11t^2 - 5t\), find \(\frac{d^2v}{dt^2} = 22\). 2. For \(10 \leq t \leq 20\), \(v(t) = 1100 - 5t\), find \(\frac{d^2v}{dt^2} = 0\). 3. For \(20 \leq t \leq 30\), \(v(t) = 50t + 2(t-20)^2\), find \(\frac{d^2v}{dt^2} = 4\). Now we have the jerk function for each interval of time.
04

Plot the Acceleration and Jerk Functions

Using graphing software or a calculator, plot the acceleration and jerk functions against time for the given intervals: 1. Acceleration: Plot \(\frac{dv}{dt} = 22t - 5\) for \(0 \leq t \leq 10\), \(\frac{dv}{dt} = -5\) for \(10 \leq t \leq 20\), and \(\frac{dv}{dt} = 50 + 4(t-20)\) for \(20 \leq t \leq 30\). 2. Jerk: Plot \(\frac{d^2v}{dt^2} = 22\) for \(0 \leq t \leq 10\), \(\frac{d^2v}{dt^2} = 0\) for \(10 \leq t \leq 20\), and \(\frac{d^2v}{dt^2} = 4\) for \(20 \leq t \leq 30\). By observing the plots, we can understand how the acceleration and jerk change over time, which is crucial for assessing the risks associated with injuries such as whiplash.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Simpson's Rule
Simpson's Rule is a popular technique in numerical analysis for approximating the definite integral of a function. It is especially useful when you want to evaluate the area under a curve, such as finding the distance covered by an object when given its velocity over a time interval.
Simpson's Rule works by dividing the interval into even segments and using parabolic arcs rather than line segments to approximate the curve. To apply Simpson's Rule, follow these steps:
  • Divide the interval into an even number of sub-intervals (). This allows you to use pairs of points to apply the parabolic approximation.
  • Calculate the width of each sub-interval () as the total range divided by the number of sub-intervals.
  • Apply the formula: \[S \approx \frac{\Delta t}{3} [f(0) + 4\sum_{i=1}^{n/2} f(2i-1) + 2\sum_{i=1}^{n/2-1} f(2i) + f(10)]\]where \( f(t)\) is the function you're integrating.
This rule is particularly effective when dealing with polynomial functions, and students will find it to be a valuable tool when tackling various calculus and physics problems.
Numerical Differentiation
Numerical Differentiation focuses on estimating the derivatives of functions. This is crucial when you have data rather than a clear function, or when the function is complex and difficult to differentiate analytically.
In the context of the given exercise, we calculate derivatives to find both the acceleration and jerk of the rocket. Here's how you can approach this:1. **First Derivative for Acceleration**: - For the velocity function \(v(t)\), the first derivative \(\frac{dv}{dt}\) provides the acceleration.
  • For example, if \( v(t) = 11t^2 - 5t \) for \( 0 \leq t \leq 10 \), the acceleration is \( \frac{dv}{dt} = 22t - 5 \).
2. **Second Derivative for Jerk**: - Taking the derivative of the acceleration function gives you the jerk, \(\frac{d^2v}{dt^2}\).
  • Using the earlier example, the jerk would be constant \( 22 \) over the interval.
Numerical differentiation provides insights into changes in motion, like how quickly velocity is changing (acceleration) and how this acceleration evolves over time (jerk). These analyses are crucial for understanding dynamics and potentially harmful changes in motion.
Acceleration and Jerk Analysis
Acceleration and jerk analysis in mechanical systems is fundamental for predicting the forces experienced by moving objects. In the context of the rocket example, acceleration tells us how quickly the rocket is speeding up or slowing down, whereas jerk informs us about how the acceleration itself is changing.
**Why It Matters**:- **Acceleration**: Helps us understand how the rocket's velocity changes over time, which is crucial for navigation and performance. - For example, knowing the equation \( \frac{dv}{dt} = 22t - 5 \) allows control systems to adjust their strategies.- **Jerk**: This is often less discussed, but equally important. It's linked to comfort and safety. - In transportation, sudden jerks can lead to discomfort or injury, as abrupt changes in acceleration cause stress on the body.Understanding these concepts allows engineers to design systems that prevent rapid changes in acceleration, thereby protecting passengers and equipment. This explains why jerk is a critical design constraint, even though it might not feature prominently in basic physics classes.

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