If an object accelerates from rest, with a constant acceleration of 7.1 m/s^2, what will its velocity be after 22 s?

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?