Why did some of the particles get deflected in rutherford's experiment?

May someone explain how to do this question?

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?