Jean used an electronic scale to measure the mass of a rock: 40g. Then through the displacement method, she measured its volume: 10 mL. What is the density of the rock? Group of answer choices

0.25 g/mL

40 g/mL

400 g/mL

4 g/mL

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Ms.hidalgo opens the door to her classroom. her classroom is 60 degrees and the air outside is 80. predict what will happen using your knowledge of how heat flows.

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.