Asolid magnesium flare has a mass of 1300 g and a volume of 743 cm3 what is the density of the magnesium

Alexander calder's mobiles are an example of motion because it uses forces of wind and water.

Is the alien theory a scientific claim? why or why not? just took the test it was , : " the alien theory is not a scientific claim because it is not based on valid data, there is no evidence to support it, and it does not come from a reliable source."

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?