Please help me out! What is the measure of arc YZ
A) 180°
B) 11”
C)63
D) 59”

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?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter