1.which of the following is an example of a second-class lever?

wheelbarrow
broom
crowbar
shovel

2.which of the following is an example of a first-class lever?

rake
nut cracker
seesaw
elbow joint

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?