Calculate the angular velocity of planet Mercury and its tangential speed around the Sun. Mercury's distance from the sun is 5.7909227 x 10^ 10 m. Mercury's mass is 3.285 × 10^23 kg. Period = 88 days.

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j