How may substance be tested to determine whether or not it is an element?

Two positions of the sun, moon, and Earth are described below: Position A: Moon is between the sun and Earth Position B: Moon and sun are at right angles to each other relative to Earth Which statement is true regarding the type of tides that can

For an isothermal process, the work done by or on a system of ideal gas is equal to the change in what?

Which is expected to be more stable 6/3Li or 9/3Li

If humans only have three kinds of color photo-receptors, how can we see so many different colors?

When magnesium (Mg2+) and fluorine (F1-) combine in an ionic bond, the resulting formula will be A) Mg2F. B) Mg2F2. C) MgF. D) MgF2.

What causes day and night on earth?

A yo-yo can be thought of as a solid cylinder of mass m and radius r that has a light string wrapped around its circumference (see below). One end of the string is held fixed in space.

Why is time an independent variable and position is a dependent variable in a position versus time graph

A geologist estimates that a large boulder weighs 7840 N. What should he estimate the mass of this boulder to be? A. 650 kg B. 740 kg C. 780 kg D. 800 kg

Two objects have the same momentum. Do the velocities of these objects necessarily have (a) the same directions and (b) the same magnitudes? Give your reasoning in each case.