A block of mass m is pulled along a horizontal frictionless surface by a rope

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

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o

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?