What is the definition of a vector?

Why does the input force have to be greater than the force needed to lift the bale?

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?