The size of a balloon increases when the pressure inside it increases. The balloon gets bigger when it is left in the heat from the Sun. Why does this happen?

Which subatomic particle has a negative charge

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value