Why tungsten is not used in heating device?

The density of a liquid could be found by using

Which is not one of the major climate zones? question 3 options: rain forest polar tropical temperate

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.