Which of the following is trueregarding the properties of light?
a. light can only travel in a straight line.
b. light has a dual nature and acts like both a wave and a particle.
c. light is not able to display interference or diffraction.
d. light needs a medium to propagate through a vacuum.

This problem has been solved! see the answera non-uniform fire escape ladder is 6.0m long whenextended to the icy alley below. it is held at the top by africtionless pivot, and there is neglibible frictional force fromthe icy surface at the bottom. the ladder weighs 250n, and it'scenter of gravity is 2.0m along the ladder from the bottom. amother and child of total weight 750n are on the ladder 1.5m fromthe pivot. the ladder makes an angle θ with the horizontal.find the magnitude and direction ofa) the force exerted by the icy alley on the ladderb) the force exerted by the ladder on the pivotc) do your answers in part a and b depend on the angle?

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine