Suppose an astronomer known for joking around told you she had found a type-o main-sequence star in our milky way galaxy that contained no elements heavier than helium. would you believe her? why?

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air

Which best term to describe a chemical reaction that absorbs energy from its surroundings? a.thermal conductor b.thermal insulator c.endothermic d.exothermic