4. A girl is suspended motionless from a bar which hangs from the ceiling by two ropes. A free-body diagram for the girl in this situation looks like this:

Which of the following describes something an engineer would probably do first when developing new technology meant to reduce ocean pollution? o a. evaluate the benefits and challenges of using certain chemicals to purify water. o b. research new scientific findings in regard to ocean cleanup. o c. identify the need to reduce ocean pollution. o d. research what has been done in the past to clean up oceanic oil residue.

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

What kind of simple machine is a catapult?