Power of Gravity on a Moving Mass: Analyzing Mean and Instantaneous Values

AI Thread Summary
The discussion focuses on analyzing the mean and instantaneous power developed by gravity on a mass thrown at an angle with an initial velocity. Participants clarify that the net displacement (delta r) is orthogonal to the gravitational force (mg), which is crucial for understanding the power calculations. It is established that the body begins and ends its motion on the same horizontal plane. The direction of displacement during the time of flight is also confirmed to be horizontal. This understanding is essential for solving the problem effectively.
danilo_rj
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A body of mass m is thrown at an angle alpha to the horizontal with the initial velocity v0. Find the mean power developed by gravity over the whole time of motion of the body, and the instantaneous power of gravity as a function of time.

I didn't understand why delta r is orthogonal to mg. Where delta r is the net displacement of the body during time of flight.
 
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Where does the body begin and end its motion? What's the direction of that displacement?
 
what is said in the problem is only this, there is no picture.
 
You are given all the information needed to answer my question.
 
Ok. So I have to suppose that the beggining and the ending of the motion is at a same plane.
 
Exactly.
 

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