Explain when insulator, conductor, and semiconductor is and what it does. give examples.
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Explanation:

Insulator: An object that does not conduct the electricity. Its conductivity is very low. It is also known as the poor conductor of electricity.  For example, wood, rubber etc.

Conductor: An object that conducts the electricity. Its conductivity is very high. It is also known as the good conductor of electricity. For example, aluminium, copper etc.

Semiconductor: An object that's conductivity lies between the insulator and conductor. Its conductivity is moderate. For example, silicon and germanium.

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures

answer(20) psi;