Noah drops a rock with a density of 1.73 g/cm3 into a pond. will the rock float or sink? explain your answer.

It sinks

Explanation: Density of water is approximately

Any substance that has higher density than that of water will sink and any substance that has density lesser than water will float.

Thus a higher density substance has more mass for the amount of volume it displaces and hence it sinks.

When Noah drops a rock in water, the rock will sink as it has a higher value of density than that of water

car a and b are moving in opposite directions

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it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me