What must quantities have before they can be added or subtracted?

Current flowing in a circuit depends on two variables. Identify these variables and their relationship to current.

People in the United States know that water boils at 212 Degrees Fahrenheit. In Europe, people know that water boils at 100 degrees Celsius. Is the water in the U. S. different than the water in Europe? What explains the two different temperatures

The terms sanity and insanity:

Elements that are gases, brittle and poor conductors are?

The power source with the lowest environmental impact is

Changing the direction of current will or will not affect the strength of an electromagnet

A swimming pool has the dimensions of 10 meters, 5 meters, and 1 meter. What is the pool's volume? 50 m 50 m3 50 m2 25 m3

A child pushes horizontally on a box of mass m which moves with constant speed v across a horizontal floor. The coefficient of friction between the box and the floor is μ. At what rate does the child do work on the box?

What two qauntities must be known to calculate the density of a sample of matter

An element's atomic number is 38. How many protons would an atom of this element have?