Will the density of an object on the moon be less than, the same as, or greater than the density of that object on Earth? Show Answer

Answer: The same. Mass is the amount of matter within an object; mass is the same whether the object is on Earth or the moon. Volume would be the same as well, and so density would remain the same.

Say we have an object that ordinarily sinks in water. Is there any way that we could make this object float in water through some physical change (such as cutting or crushing)? Show Answer

Answer: No. If an object undergoes a physical change, the identity of the object never changes, and so it would have the same density. For example, if an object is cut in half, its mass would be halved, but so would its volume, and so the object would have the same density.

BMI is a measurement that compares a person's height to his or her weight to determine whether he or she is in a healthy weight range. Typically, those with higher BMIs are considered to be overweight. However, profressional athletes tend to have higher BMIs than nonathletes of the same size, even though they are obviously very fit. Why do you think that is? Show Answer

Answer: Athletes tend to be more muscular than others of the same size. Muscle is denser than fat, about 15% denser, and so a muscular athlete is usually heavier than an ordinary person of the same size/volume. This makes the athlete's density, and BMI, higher.