What Does a Unit Vector Field Look Like in Cartesian Coordinates?

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A unit vector field in Cartesian coordinates represents a set of points where the magnitude of the vector S equals one. To solve for this, one needs to express the condition mathematically in terms of x, y, and z coordinates. The discussion emphasizes that having already computed the magnitude of S in part (b) is crucial for progressing to part (c). The key is to identify the locus of points that satisfy the condition |S| = 1. Understanding this mathematical representation is essential for solving the problem effectively.
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Hello guys !

i have this problems while solving problems on vector calculus ..

Fps0q98.png



i solved (a) , (b)
as i put P(2,4,3) in the formula of S and i solved it and i solved (b) as a(S)= S/lSl

but in (c) i don't how what should i do to solve it ..please help me guys ..Thank you
 
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As you have solved b you must have already computed |S|. From having that expression you should be able to progress.
 
Where the magnitude of S is 1, what does that look like mathematically in terms of x y and z? In other words, you have a locus of points, and all of these points, when you calculate the magnitude of S there, it's equal to 1. What does this look like mathematically?
 
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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