4.6. A block of mass 20kg is at rest on a rough horizontal ground.
The coefficient of friction between the block and the ground is 0.3. A
horizontal force F is applied steadily to the block according to the
law: F=ť - t + 4, F is in newtons and t is the time in seconds
Calculate the time it takes the block to start moving. What is the
speed of the block when t = 4.Os.

Which force is most responsible for binding together an atom's protons and neutrons? electrostatic gravitational nuclear magnetic

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?

Herbivores, carnivores, and omnivores are all types a. decomposers b. producers c. consumers d. biomes