A sample of steam at 15 bar pressure and 400°C temperature is first expanded at a constant enthalpy to 6 bar and then expanded isentropically where the dryness fraction of the steam is 0.90. Find the change of enthalpy, the pressure of isentropically expanded steam and change of entropy

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.