Increasing the surfactant concentration above the critical micellar concentration will result in: Select one:
1.An increase in surface tension
2. A decrease in surface tension
3. No change in surface tension 4.None of the above​

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

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