If the fixed carriage and the sliding carriage are at a radius of 15 cm and you add a total mass of 300 g to the sliding carriage, what total mass in grams should you have in the fixed carriage

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Of is j/kg·k. if a 2.6 kg of isk to k,is ?

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?