Two boxes of masses m and 3m are stacked. the surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. if the less massive box does not slide on the more massive box, what is the static friction force on the less massive box?

Apositive rod is placed to the left of sphere a, and the spheres are separated. which best describes the spheres? sphere a is negative and sphere b is positive because protons from sphere a are attracted to the rod and move to sphere b. sphere a is negative and sphere b is positive because electrons from sphere b are attracted to the rod and move to sphere a. sphere a is positive and sphere b is negative because electrons from the rod move to sphere b and protons then move to sphere a. sphere a is positive and sphere b is negative because protons move from sphere b to the rod and also to sphere a.

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

In automobile steering wheel is shown what is the ideal mechanical advantage blank? if the ama is eight what is the efficiency of the steering wheel?