As shown in the picture, ball A and ball B are connected by a rigid weightless pole AB and also a weightless rope of length L through pulley C. The mass of ball A is three times of ball B, find the length of AC

Ineed the answer to question 1 , i’m desperate

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

What is the rate of change in a objects position?