Because heat can either be hot which is positive, or cold which is negative. Hot and cold are relative terms which means it is a comparison to another temperature.
it's only negative if it's being multiplied by a positive number. If it's being multiplied by another negative number than it will be positive.
yes
sometimes
In multiplication and division: always. In addition: never. In subtraction: sometimes.
Negative * positive = negative Positive * positive = positive Negative * negative = positive
Sometimes.* If "n" is positive, "-n" is negative. * If "n" is negative, "-n" is positive. * If "n" is zero, "-n" is also zesro.
Heat is energy and cannot be negative, If you are talking about heat flow then if you define outflow to be negative then inflow is positive.
no sometimes there positive i
it's only negative if it's being multiplied by a positive number. If it's being multiplied by another negative number than it will be positive.
yes
yes
this term is positive but sometimes can be negative. Ethnocentric is a big cause of civil wars
sometimes
Yes. But NOT always.
sometimes
No, when heat flows into a system, it is considered positive. Positive heat indicates heat is being added to the system, increasing its internal energy. Negative sign would indicate heat is being lost or leaving the system.
heat