QI. A student is swinging a 200 g yo-yo on a 1.0 m long string. How fast must the yo-yo be moving at the bottom of the circle to reach the top
of the circle with no speed?

Density of salty water as compared to the density of pure water is(a) is less(b) is always equal(c) is always more(d) may be less or more

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.

How do you count the total number of atoms present on one side of a chemical equation?