The gravitational force between which two objects would be the most difficult to notice?

A.

a water particle and an air particle

B. the Moon and a water particle

C. the Moon and the Earth

D. the Earth and the Sun

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Indicar verdadero (V) o falso (F) con respecto al movimiento parabólico : la componente horizontal de la velocidad permanece constante. () la componente vertical de la velocidad puede ser nula en un instante.

If element x has 28'protons how many electirons does it have

Which of the following are examples of natural forces? A. optical B. phase C. gravity D. nuclear

Which condition in a nebula would prevent nuclear fusion? A) the presence of nitrogen and carbon B) a decrease in the overall volume of gases C) a core temperature of only ten thousand Kelvin D) Physical contact between bare nuclei

Why do nuclear power plants use fission rather than fusion to generate electric energy? A. Fission produces less radioactive waste than fusion does. O B. Fusion requires very high pressure and temperature. C.

Water is a compound. O A. True B. False

How do air quality scientists ensure the air is cleaned? What steps do they take?

Is a mirrors surface opaque or transparent or translucent?

Sound waves can combine to become bigger or smaller true or false

Archimedes supposedly was asked to determine whether a crown made for the king consisted of pure gold (density of gold is 19.3 * 103 kg/m3). According to legend, he solved this problem by weighing the crown first in air and then in water.