8 A uniform ladder is resting on a vertical wall. Friction between the ladder and the ground and also between the ladder and the wall prevents the ladder from slipping.B AWhich row in the table shows the direction of the contact forces on the ladder at points A and B? C at point A ...
have a resl表达错误，应该是have a rest，意思是：休息一下，歇一会 一、have a rest解析如下：1、音标： 英[hæv ə rest] 美 [hæv ə rest]2、意思：休息一下，休息一会，歇一会 3、近义词：take a break 4、例句：When the race was over, they were all ...
When he retires 80 m from the corner, along the same straight line, he finds the angle to be 30∘. The length of the field is A20 B40√2 C40 D20√2SubmitA ladder is resting against a wall, The angle between the foot of the ladder and the wall is 45∘ and the foot of ...
Imagine a ladder leaning against a vertical wall with its feet on the ground. The middle rung of the ladder has been painted a different colour on the side, so that we can see it when we look at the ladder from the side on. What shape does that middle rung trace out as the ladder ...
A heavy ladder resting on floor and against a vertical wall may not be in equilibrium if a)floor is smooth and wall is rough b)floor is rough and wall is rough c)both floor and wall are rough d)both floor and wall are ...
A uniform ladder of weight W rests in equilibrium with one end on rough horizontal ground and the other resting against a smooth vertical wall. The vertical plane containing the ladder is at right angles to the wall and the ladder is inclined at 60°to the horizontal. The coefficient of fr...
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A ladder is supported against a wall opposite a window for instance, by means of a telescopically adjustable crossbar having wheels at the ends for resting on the wall at the sides of the window. The bar is clamped to a step of the ladder....
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In summary, a ladder with a weight of 200n and length of 5m is resting on a horizontal rough concrete surface and leaning against a smooth wall. The angle between the ladder and the concrete is 40 degrees, and the question is asking for the coefficient of static friction. The solution ...