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An object's acceleration increases quadratically with time: \(a(t)=b t^{2}\), where \(b=0.041 \mathrm{~m} / \mathrm{s}^{4}\). If the object starts from rest, how far does it travel in \(6.3 \mathrm{~s}\) ?

Short Answer

Expert verified
Substituting the given variables into the displacement function gives \( s(6.3) = \frac{0.041}{12} * (6.3)^4 = 4.2 m \). So, the object travelled 4.2 m in 6.3 seconds.

Step by step solution

01

Derive the velocity function

The acceleration function is given as \( a(t) = b t^2 \). The integral of acceleration gives the velocity function. Integrating \( a(t)\) with respect to \( t \), we get \( v(t) = \frac{b}{3} t^3 \) since the object starts from rest, implying there is no constant of integration.
02

Derive the displacement function

Now we need to derive the speed-length path. This is the integral of the velocity with respect to time, so integrating \( v(t)\) with respect to \( t \), we get \( s(t) = \frac{b}{12} t^4 \) as this is a second integration, and the object starts from rest, there is no constant of integration.
03

Calculate the displacement

We now substitute the given time \( t = 6.3 s \) into the overall displacement function \( s(t) = \frac{b}{12} t^4 \). Solving for \( s(t) \) we get the total displacement or distance the object has traveled.

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Key Concepts

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

Physics Problem Solving
Physics problem solving involves breaking down complex problems into simpler parts to understand and solve them efficiently. In this exercise, we want to determine how far an object travels when its acceleration changes as a quadratic function of time.
One key to physics problem-solving is understanding the relationships between kinematic variables: acceleration, velocity, and displacement. We start by recognizing what is given and what needs to be found. In this exercise, the acceleration function is given, and the task is to find the displacement.
It's crucial to utilize mathematical techniques such as calculus in physics problems to derive other aspects of motion. By integrating the acceleration function, we first find the velocity, and a subsequent integration gives us the displacement. Carefully following these steps helps ensure accuracy, which is central when tackling physics exercises.
Kinematics
Kinematics deals with the motion of objects and is a fundamental aspect of physics. In this problem, the object's acceleration is given as a function of time: it increases quadratically.
Understanding kinematics requires familiarity with key concepts such as:
  • Acceleration: The rate at which an object's velocity changes. In this case, it's a function of time: \(a(t) = b t^{2}\).
  • Velocity: The rate at which an object's position changes. We determine it by integrating the acceleration. It shows how quickly and in what direction the object moves.
  • Displacement: The overall change in position of the object. It's found by integrating the velocity over time.
In this exercise, kinematics reveals the path and distance traveled by an object with time-varying acceleration. Recognizing these fundamental physics relationships will aid in solving more complex scenarios.
Integration in Calculus
Integration in calculus is a mathematical tool used to find quantities when given their rates of change. This is particularly useful in kinematics, where we often need to go backward from acceleration to find velocity and displacement.
In this problem,
  • We first integrate the given acceleration function \(a(t) = b t^{2}\) to find the velocity. This results in \(v(t) = \frac{b}{3} t^3\).
  • Then, we integrate the velocity function to find the displacement, obtaining \(s(t) = \frac{b}{12} t^4\). This function represents how far the object has traveled over time.
Integration transforms a rate of change into an accumulated quantity, underpinning significant physical principles. It's like piecing together a puzzle where each integral reveals another part of the motion.

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Most popular questions from this chapter

Starting from rest, a car accelerates at a constant rate, reaching \(88 \mathrm{~km} / \mathrm{h}\) in 12 s. Find (a) its acceleration and (b) how far it goes in this time.

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