A) the tension in the string GH is 6 g
B) the tension in the string GH is zero
C) the tension in string GH is \[\frac{21}{4}g\]
D) the 2 kg block remains in equilibrium
Correct Answer: C
Solution :
[c]In equilibrium, just before the string AB is cut the tension in spring is 5g. |
Just after the string AB is cut the spring force won't change but all blocks except of 5 kg start accelerating. |
Rough free body diagram is shown in figure. |
\[a=\frac{\text{Net pulling force}}{\text{Total mass}}\]\[=\frac{5g+g-3g}{4}=\frac{3g}{4}\] |
For 1 kg block (connected to spring) |
Free body diagram would be as shown |
\[5g+g-T=1\times \frac{3g}{4}\] |
\[T=6g-\frac{3g}{4}=\frac{21}{g}\] |
You need to login to perform this action.
You will be redirected in
3 sec