A metal ball weighs 200 Newton in air. When the ball is submerged in water it weighs 150 Newton. The weight of water displaced by the submerged ball is… A. 50
B. 150
C. 200
D. 100

there are no components of a physical goal mentioned on the list of choices that you've provided.

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray

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.