Một ngƣời di chuyển một chiếc xe với vận tốc không đổi. Lúc đầu ngƣời ấy kéo xe về phía trƣớc, sau đó ngƣời đẩy
xe về phía sau.
Trong cả hai trƣờng hợp, càng xe hợp với mặt phẳng nằm ngang một góc α. Hỏi
trong trƣờng hợp nào ngƣời ấy phải đặt lên xe một lực lớn hơn? Biết trọng lƣợng của xe
là P, hệ số ma sát giữa bánh xe và mặt đƣờng là k.

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?

How is the gravitational force related to the distance between two objects?

Urgent pls a. coal consumption levels off and remains flat. b. petroleum, natural gas, and renewables show an increase in consumption c. more nonrenewable resources continued to be consumed than renewable. d. there is little projected increase in nuclear energy use. e. carbon dioxide emissions are projected to decline as we approach 2040. global energy consumption is defined as the total energy used by an individual or organizations from around the world. use the graph above to analyze the projected energy consumption from now until 2040. which statements in the prompt apply? a) a, b, d b) b, c, d c) a, c, d d) a, b, c, d