1. What is a knife? A wheel and axle, a wedge, a pulley, or a lever?
2. What is an electric fan? A wheel and axle, a wedge, a pulley, or a lever?
3. A human arm works like a simple machine called a . The elbow works like a . A pulley; rope, a lever; fulcrum, a wheel and axle; axle, a pulley; wheel.

HELP

Astudent is working in the lab to determine how time affect impulse the student keeps the force the same in each row but changes impact the time some data is shown witch trial has the greatest a student is working in the lab to determine how time affect impulse the student keeps the fours the same in each row but change is the impact time some data shown witch trial has the greatest impulse

If steel is more dense that lake water, why can a boat float

Which branches of natural science include the study of an organism that lived 10 million years ago