Which of the following accurately shows how to calculate the weight of a 20 kg object?
a) 20 kg x 9.8m/s2
b)20 kg/ mass of the earth
c)20 kg/9.8 m/s2
d) 20 kg x mass of the earth

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.