Which force causes this projectile motion? -horizontal contact force from the hand
-Both horizontal contact force from the hand and gravity
-friction
-gravity
-All of these
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Which surface feature of the moon is characterized by mountainous areas? terrae craters maria regolith

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

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?