According to the periodic table of elements, calcium (ca) has: a- 20 protons and 20 electrons b- 40.08 protons c-20 protons and 20.08 electrons d-20 protons and zero electrons

The law of conservation of energy states that energy cannot be created or , energy can be from one substance to another. the first blank is ' destroyed ' and for the second blank is ' transferred '

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant