2.
r represents the radius d the density, v the speed and the coefficient of
viscosity, then the quantity rdv/has the dimensions of
b. length
c. time
d. force

wavelegth as in spectrum red oygbiv

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.