When you have finished, describe your car and your results below

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

If a star is moving toward earth, it is