True or false. a machine decreases the amount of work done

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

Abar magnet cut in half will form a total ofpoles. a)fourb)eightc)two

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?