Explain in terms of energy transformations how a Newton's cradle illustrates the conservation of energy.

A) Dropping the ball transfers the gravitational energy to the others causing the ball on the opposite side to swing up.

B) Swinging the ball into the others, transforms the endothermic energy causing the ball on the opposite side to swing up.

C) Impacting the ball into the others, fixes the exothermic energy to the balls causing the ball on the opposite side to swing up.

D) As the ball drops and impacts the others, the energy is transferred through the balls causing the ball on the opposite side to swing up.

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

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.