An object traveling at constant speed v in a circle of radius R has an acceleration a = 5 m/s2. If both Rand v are doubled, what is the new acceleration? 40 m/s^2
10 m/s^2
5 m/s^2
2.5 m/s^2

Aballet student who learns with the of his instructor is demonstrating learning.

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?

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j