A 50 kg block of wood is pressed against a smooth wall by a force perpendicular to the wall.If the coefficient of static friction is 0.13 ,what is the minimum force that is necessary to keep the block of wood in place?模糊的翻译:一个50 公斤

Block A has a mass of 3 kg and Block B has a mass of 5 kg.Just before colliding,Block A has a speed of 4 m/s and Block B is at rest(0m/s).After the collision,Block B has a speed of 3m/s in the same direction that Block A was initially.What is the spe the roof of a block of 一道英文物理题目(英文其实很简单).求高手解答~~~~~~~~~~~~~A 10-kg block is connected to a 40-kg block.The surface on that the blocks slide is frictionless. A force of 50N pulls the blocks to the right.a) what is the magnitude of the A 50 kg block of wood is pressed against a smooth wall by a force perpendicular to the wall.If the coefficient of static friction is 0.13 ,what is the minimum force that is necessary to keep the block of wood in place?模糊的翻译:一个50 公斤 第二道!紧急A block of mass m = 2.0 kg is held in equilibrium on an incline of angle θ = 60° by the horizontal force FDetermine the normal force exerted by the incline on the block the roof of a block of flats这里的block作什么解释? on the roof of a block of flats 可以改成on the roof of a flats' block吗 A 2.30-kg block starts from rest at the top of a 30.0° incline and slides a distance of 1.90 m down the incline in 1.80 s.(a) Find the magnitude of the acceleration of the block._________ m/s2(b) Find the coefficient of kinetic friction between bloc 大学物理题（）,A 15-g bullet is shot vertically into an 5-kg block.The block lifts upward 3.0 mm (see the figure).The bullet penetrates the block and comes to rest in it in a time interval of 0.0010 s.Assume the force on the bullet is constant Is there a f( ) in front of block block of flats block model of learning 英语 词组 a block of apartment 和 a office block中文 解释、***（一样吗?）***（block取“ 大楼 大厦 ”之意）(不要词霸 之类的翻译 ) A 4 kg block free to move on a horizontal,frictionless surface is attached to a spring.The spring is compressed 0.15 m from equilibrium and released.The speed of the block is 1.15 m/s when it passes the equilibrium position of the spring.The same exp block a vote a block of flats (Br) =a bolck of ____ (Am) change of block 什么意思 block number is out of