The pedals on a bicycle give a mechanical advantage by allowing you to turn the pedals a distance to turn the circumstance of the wheels.

a)long, larger
b)long, shorter c)short, larger
d)short, shorter

Newton's law of universal gravitation states that the force f between two masses, m1 and m2, is given below, where g is a constant and d is the distance between the masses. find an equation that gives an instantaneous rate of change of f with respect to d. (assume m1 and m2 represent moving points.)

Positrons are spontaneously emitted from the nuclei of

What is the role of lenses in microscopy?