In a convection current, as the temperature of a fluid increases, what property of the fluid decreases?

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

The scalar triple product computes the magnitude m of the moment of a force vector f about a specified line. it is m = (r × f) · n, where r is the position vector from the line to the point of application of the force and n is a unit vector in the direction of the line. use matlab to compute the magnitude m for the case where f = [12, −5, 4] n, r = [−3, 5, 2] m, and n = [6, 5, −7].

Explain why electric current cannot exist if a current doesn't have a voltage source.