What must an object experience a frequency equal to in order for resonance to occur? A) its period B) its natural frequency C) its amplitude D) its wavelength

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

In an exothermic reaction, energy may be released to the surroundings in the form of question 4 options: heat light thermal all of the above

The equation below shows a chemical reaction. a + b + heat —> c + d according to the law of conservation of energy, which statement is true? a. the reactants absorb heat because they have less energy than the products. b. the products release heat because they have more energy than the reactants. c. the reactants generate heat because they have more energy than the products. d. the products require heat to form because they have less energy than the reactants.