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- Homework Statement
- I am interested to understand how to tell when to use the scalar or cross product when solving physics problems.

- Relevant Equations
- Instantaneous angular momentum = cross product of the instantaneous position vector and instantaneous momentum

Hi!

For example, how do you tell whether to use the scalar or cross product for an problem such as,

However, I do know that instantaneous angular momentum = cross product of the instantaneous position vector and instantaneous momentum. However, what about if I didn't know whether I'm meant to take the cross product or scalar product of the quanties given. For example, for this work problem,

How would I tell whether to use the scalar or dot product just by looking at the work equation,

Many thanks!

For example, how do you tell whether to use the scalar or cross product for an problem such as,

However, I do know that instantaneous angular momentum = cross product of the instantaneous position vector and instantaneous momentum. However, what about if I didn't know whether I'm meant to take the cross product or scalar product of the quanties given. For example, for this work problem,

How would I tell whether to use the scalar or dot product just by looking at the work equation,

Many thanks!

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