Positively-charged particles consisting of two protons and two neutrons emitted by radioactive materials is called

Alpha particle

Explanation:

Alpha decay is defined as the decay process in which a heavier nucleus decays into a lighter nuclei. This decay process releases alpha particle which is also known as helium nucleus.

Alpha particle released carries a mass of 4 units and a charge of +2 units. The alpha particle is also known as helium atom.

In this decay, the atomic number of the atom released gets reduced by 2 units and atomic mass is reduced by 4 units as helium contains 2 protons and 2 neutrons as atomic number is 2 and mass number is 4.

The chemical equation for the alpha decay process is given as:

Alpha particle

Explanation:

6 cos 34, 6 sin 34 trig

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )