Joey's little brothers makes a ramp to push his toy dump truck up to his sandbox. If he uses 5N of force to push the 12N truck up the ramp, what is the mechanical advantage of his ramp ? PLEASE HELP ME HERE.

An object of dimensions 50 cm x 40 cm x 0.20 cm has a mass 60g. find its density in g/cm3 and kg/ m3

Which statement correctly describes the relationship between frequency and wavelength?

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f