A wheel is used to turn a valve stem on a water valve. The wheel radius is 4 inches and the axle radius is .25 inches.

a)What is the mechanical advantage of the wheel and axle?

b)How much resistance force can be overcome when an effort of 6 lbs is applied to the wheel of the water valve in this problem?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

What is a costume plot? why is it important to a film or theater production?

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?