What material or metal is this: 10 cm * 12 cm * 4,25 cm. It weighs 6 kgs. It's not magnetic. I got it from my mothers heritage.

Which of the following are sources of revenue for media companies? a. direct sales to producers b. advertising and subscriptions c. online purchase d. capital investments

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products

50 points - answer entirely - will reward brainliest