How to Calculate Dot Product of Two Vectors?

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To calculate the dot product of the vectors F = 10i + 6j - 3k lb and B = 6i - 2j ft, the formula F dot B = FxBx + FyBy + FzBz is used. The components are multiplied accordingly: (10 * 6) + (6 * -2) + (-3 * 0), resulting in 60 - 12 + 0. The final calculation yields a dot product of 48 lb-ft. The solution provided is confirmed as correct.
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Homework Statement


obtain the dot product of the two vectors F= 10i + 6j - 3k lb and B= 6i -2j ft

Homework Equations


F dot B = FxBx + FyBy + FzBz
x is for the x components
y is for the y components
z is for the z components

The Attempt at a Solution


F dot B = (60 + -12 + 0)
I ended up with 48 lb-ft. I really just want someone to check my work. thanks
 
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That's correct.
 
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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