Which of these choices states Newton’s law of universal gravitation? 1) As a planet moves around its orbit, the planet sweeps out equal areas in equal amounts of time.
2) The orbit of a planet, or other body, around the sun is an ellipse with the sun at one focus of the ellipse.
3) The square of a planet’s orbital period is proportional to the cube of the planets mean distance from the sun.
4) Gravitational force increases as the mass of an object increases or as the distance between two objects decreases.

For a family dinner, jose’s mom baked a loaf of bread. during the meal, his grandmother commented, “this bread is so dense! ” what do you think his grandmother meant by the word dense? you have some ideas regarding density already, but this experiment will enrich your understanding of the relationship between mass, volume and the density of objects. when making measurements in this experiment we will be using si units, the international system of units. the purpose of using si units is to have the ability to communicate and compare data results with other experiments without having to make conversions. measurement symbol si unit length m meter mass kg kilogram volume l liters density kg/l kilograms per liter any calculations that are performed during this experiment will ultimately be reported in scientific notation. recall that scientific notation is extremely important when we have data that is extremely small or large. scientists rely on a standard form of communication to quickly make hypotheses and judgements based on data. what is the density of block a? a0kg/l what is the density of block b? a1kg/l what is the density of block c? a2kg/l what is the density of block d? a3kg/l what is the density of block e? a4kg/l which block is the densest? a5