The stream function of a two-dimensional, incompressible flow field is given by v=axy, where x and y are in meters, and a is a dimensional constant, 5/s· dy find the x and y components of velocity in this flow field, named u and v, respectively, at (x, y) (2, 1). ii) calculate the acceleration of a fluid particle at the point (x, ,1). (iii) is the flow steady? (iv) is the flow irrotational?

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb

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.