4. Consideremos um plano inclinado, onde o corpo de massa m, = 5Kg está ligado a um corpo de massa m= 8Kg pendurado por um fio inextensível que passa através de uma roldana fixa de peso
desprezível. Sabendo que o coeficiente de atrito entre o plano e o corpo é 0,3 e o ângulo do plano é
30º. Considera g = 10m/s?, calcula:
a) A aceleração do sistema
b) A tensão no fio.
(R:38,24N)
Si
30°

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?

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?