A 4.0Kg box is at rest on a table. The static friction coefficient Us between the box and table is 0.30,and the kinetic friction coefficient Uk is 0.10. Then, a 25N horizontal force is applied to the box.

An insulated thermos contains 148 g of water at 72.7 ˚c. you put in a 11.7 g ice cube at 0.00 ˚c to form a system of ice + original water. the specific heat of liquid water is 4190 j/kg•k; and the heat of fusion of water is 333 kj/kg. what is the net entropy change of the system from then until the system reaches the final (equilibrium) temperature?