An asteroid is discovered in a nearly circular orbit around the Sun, with an orbital radius that is 2.51 times Earth's. What is the asteroid's orbital period , its "year," in terms of Earth years?

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)