A wheelbarrow contains two simple machines a lever and a wheel and axle. For a certain wheelbarrow, the lever has an efficiency of 76 percent, and the wheel and axle has an efficiency
of 64 percent. What is the overall efficiency of the wheelbarrow?

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the

What is special about a dc circuit ?

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.