Two blocks of mass 4 kg and 3 kg are each initially 7 m above the ground and they are connected with each other by massless cord that passes over massless and frictionless pulley. The pulley is 20 m above the ground. 2.0 s after system is released, a naughty boy cuts the cord. What maximum height does the lighter object reach after the system is released? Select one: a. 15.0 m b. 14.2 m c. 10.2 m d. 12.0 m e. 14.6 m
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Therefore, the acceleration of the system is a = G/7 = 1.4 m/s^2. Show more…
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Two blocks of mass $m=5 \mathrm{~kg}$ and $M=10 \mathrm{~kg}$ are connected by a string passing over a pulley $B$ as shown. Another string connects the centre of pulley $B$ to the floor and passes over another pulley $A$ as shown. An upward foree $F$ is applicd at the centre of pulley $A$. Both the pulley are massless. Find the acceleration of blocks $m$ and $M\left(\right.$ in $\left.\mathrm{m} / \mathrm{s}^{2}\right)$. If $F$ is $300 \mathrm{~N}$ (a) 5,0 (b) 5,5 (c) $15,7.5$ (d) $15,2.5$
Laws of Motion and Friction
Section C
1. Two 0.20-kg blocks hang at the ends of a light flexible cord passing over a small frictionless pulley, as shown in the figure below. A 0.10-kg block is placed on the block on the right, and is removed after 2.0 s. (a) What was the tension in the cord before the 0.10-kg block was removed? After it was removed? (b) How far will each block move in the first second after the 0.10-kg block is removed?
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A block of mass 2.20 kg is accelerated across a rough surface by a light cord passing over a small pulley as shown in Figure P5.73. The tension $T$ in the cord is maintained at 10.0 $\mathrm{N}$ , and the pulley is 0.100 $\mathrm{m}$ above the top of the block. The coefficient of kinetic friction is 0.400 . (a) Determine the acceleration of the block when $x=0.400 \mathrm{m}$ (b) Describe the general behavior of the acceleration as the block slides from a location where $x$ is large to $x=0 .$ (c) Find the maximum value of the acceleration and the position $x$ for which it occurs. (d) Find the value of $x$ for which the acceleration is zero.
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