Acommercial advertisement shows a pearl falling in a bottle of shampoo. if the diameter d of the pearl is quite small and the shampoo sufficiently viscous, the drag d on the pearl is given by stokes's law, d=3πμvd where v is the speed of the pearl and μ is the fluid viscosity. show that the term on the right side of stokes's law has units of force.

Aplayground slide is 8.80 ft long and makes an angle of 25.0° with the horizontal. a 63.0-kg child, initially at the top, slides all the way down to the bottom of the slide. (a) choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? what is the change in potential energy as the child slides from the top to the bottom of the slide? (include the sign of the value in your answer.)