Correct answer only ! which of the following is a derived unit? a. ampere b. newton c. second d. kilogram

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?

First to answer will be the brainliest i need the answer asap