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Which among these forces used in momentum equation is a tensor?

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in Computational Fluid Dynamics by (118k points)
Which among these forces used in momentum equation is a tensor?

(a) Gravitational forces

(b) Pressure forces

(c) Viscous forces

(d) Electromagnetic forces

I got this question by my school principal while I was bunking the class.

I need to ask this question from Governing Equations topic in portion Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

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The correct choice is (c) Viscous forces

The best I can explain: Viscous forces are tensors. The other forces given here (Gravitational, viscous and electromagnetic forces) are vectors.

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