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The electromotive force or emf of a cell in a circuit is, for a start, not a force at all: it has the unit of volts. A good definition is ‘the power supplied by the cell per unit current through the ce...

When do you use n choose k?

Say you have n objects/elements, and each one can either be selected or not selected. ‘n choose k’ gives yo...

Some scholars have focused on sexualisation and dominance of women by men such as Hester and Millet. Some have focused on men’s controlling behavior to limit women’s social mobility such as Stark. Also...

This is the sort of question you are likely to stumble across in an IB HL Paper 2 examination. It would probably carry a few more marks and thus require a longer answer, but that is reason to panic!First ...

Just equate the centripetal force and gravitational force acting on the ISS and find v.

P. S. Google the radius and mass of the Earth, the distance to the ISS from the ground, the mass of...