19. A stone has a mass of 390 g and a density of 2.7 g/cm3. Cooking oil has a density of 0.90 g/cm².
Which mass of oil has the same volume as the stone?
A 130 g
B 160 g
C 900 g
D 1200 g
(Show the working)

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Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2