A boy pushes a lever down 2 meters with a force of 25 newtons. The box at the other end with a weight of 50 newtons moves up 2.5 meters. a. Calculate the work input by the boy

Winput = Fd

b. Calculate the work output on the box

Woutput = Fd

c. Calculate the percentage efficiency of the lever.

Efficiency = (Woutput/Winput)100%

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Assume this car is driven off a cliff . how many arrows of force need to be drawn in the free body diagram? assume no air resistance -five -one -three -four

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?