Solve Physics Problem: Find Position/Velocity

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The discussion revolves around solving a physics problem involving acceleration, initial velocity, and position. The user is struggling with the concepts due to a lack of calculus knowledge, which is essential for solving the problem using standard methods. Forum members emphasize the importance of following specific guidelines for homework help and suggest using graphs to visualize the relationships between acceleration, velocity, and position. They encourage the user to analyze the problem further and consider how to derive velocity and position from the acceleration graph. Understanding these foundational concepts is crucial for successfully solving the problem.
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Generally, I perform well academically. However, I am new to physics, and the concepts have me stumped. The question I'm struggling with most is "find the position and velocity of an object for arbitrary times if it has an acceleration of a(t) = 2t-4, an initial velocity of 4m/s, and the initial position is x=0 at time t=0.
 
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Telzis said:
Generally, I perform well academically. However, I am new to physics, and the concepts have me stumped. The question I'm struggling with most is "find the position and velocity of an object for arbitrary times if it has an acceleration of a(t) = 2t-4, an initial velocity of 4m/s, and the initial position is x=0 at time t=0.

Hi Telzis. Welcome to Physics Forums.

Since you are new to PF, you may be unaware of the rules with respect to homework problems. You are supposed to follow a specific format, and you are supposed to show what you have done so far in attempting a solution.
Regarding the specific problem you presented, have you had calculus yet?

Chet
 
Chestermiller said:
Hi Telzis. Welcome to Physics Forums.

Since you are new to PF, you may be unaware of the rules with respect to homework problems. You are supposed to follow a specific format, and you are supposed to show what you have done so far in attempting a solution.
Regarding the specific problem you presented, have you had calculus yet?

Chet

I apologize, I was unaware of the rules. I have not taken calculus.
 
Telzis said:
I apologize, I was unaware of the rules. I have not taken calculus.
This problem is very easy to do using calculus. Is this supposed to be a physics course for people who have not had calculus yet? Do you know the definition of acceleration? Do you know the definition of velocity? It is possible to do this problem without using calculus, but it takes some manipulation. What have you analyzed on this problem so far?
 
Telzis said:
Generally, I perform well academically. However, I am new to physics, and the concepts have me stumped. The question I'm struggling with most is "find the position and velocity of an object for arbitrary times if it has an acceleration of a(t) = 2t-4, an initial velocity of 4m/s, and the initial position is x=0 at time t=0.

Looks like you should draw a few Graphs - starting with acceleration vs time.

have you learned how to use information gained from an acceleration vs time graph to produce a velocity time graph?

How can you get a position vs time graph from there.
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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