A fast pitch softball player does a "windmill" pitch, moving her hand through a vertical circular arc to pitch a ball at 55 mph. The 0.19 kg ball is 45 cm from the pivot point at her shoulder.

a. Just before the ball leaves her hand, what is its centripetal acceleration?
b. At the lowest point of the circle the ball has reached its maximum speed. What is the magnitude of the force her hand exerts on the ball at this point?
c. At the lowest point of the circle the ball has reached its maximum speed. What is the direction of the force her hand exerts on the ball at this point

What is hidden during a lunar eclipse? isn't the moon hidden?

Did the proton move into a region of higher potential or lower potential? did the proton move into a region of higher potential or lower potential? because the proton is a negative charge and it accelerates as it travels, it must be moving from a region of higher potential to a region of lower potential.because the proton is a negative charge and it accelerates as it travels, it must be moving from a region of lower potential to a region of higher potential.because the proton is a positive charge and it slows down as it travels, it must be moving from a region of higher potential to a region of lower potential.because the proton is a positive charge and it slows down as it travels, it must be moving from a region of lower potential to a region of higher potential.request answerpart bwhat was the potential difference that stopped the proton? express your answer with the appropriate units.î”v î” v = nothingnothingrequest answerpart cwhat was the initial kinetic energy of the proton, in electron volts? express your answer in electron volts.ki k i = nothing ev request answerprovide feedback

Which atomic model was proposed as a result of j. j. thomson’s work?