Why is the following situation impossible? Two identical dust particles of mass 1 μg are
floating in empty space, far from any external sources of large gravitational or electric
fields, and at rest with respect to each other. Both particles carry electric charges that are
identical in magnitude and sign. The gravitational and electric forces between the particles
happen to have the same magnitude, so each particle experiences zero net force and the
distance between the particles remains constant.

When someone slams her books on a table the kinect energy is transferred into vibrations that travel to your ears as sound waves which statement describes the movement of those waves

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics