MCQ
Three masses m, 2m and 3m are attached with light string passing over a fixed frictionless pulley as shown in the figure. The tension in the string between 2m and 3m is (g is acceleration due to gravity)
- A6 mg
- B3 mg
- C2 mg
- ✓1 mg
✓
Answer
Correct option: D.
1 mg
(D)
From the figure, tension between masses 2m and 3m is $T_2$
We know that,
$T _2=\left(\frac{2 m_1 m_3}{m_1+ m _2+ m _3}\right) g$
$\therefore \quad T _2=\frac{(2 m)(3 m)}{6 m} g = mg$
From the figure, tension between masses 2m and 3m is $T_2$
We know that,
$T _2=\left(\frac{2 m_1 m_3}{m_1+ m _2+ m _3}\right) g$
$\therefore \quad T _2=\frac{(2 m)(3 m)}{6 m} g = mg$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A particle has an initial velocity of $3 \hat{i}+4 \hat{j}$ and an acceleration of $0.4 \hat{i}+0.3 \hat{j}$. Its speed after 10 s is
→A uniform rod of length 200 cm and mass 500 g is balanced on a wedge placed at 40 cm mark. A mass of 2 kg is suspended from the rod at 20 cm and another unknown mass 'm' is suspended from the rod at 160 cm mark as shown in the figure. Find the value of 'm' such that the rod is in equilibrium. $\left( g =10 m / s ^2\right)$
→Pseudo force is true only in
A ray of light travelling in a transparent medium of refractive index $\mu$, falls on a surface separating the medium from air at an angle of incidence of $45^{\circ}$. For which of the following value of $\mu$, the ray can undergo total internal reflection?
→A body is projected vertically upwards with a velocity of $10 ms^{-1}$ and another body is projected simultaneously from the same point with a velocity of $20 ms^{-1}$ at an angle of $\frac{\pi}{6}$ with the horizontal. The distance between the bodies after one second from the time projection is (Acceleration due to gravity $\left.10 ms^{-2}\right)$
→For an extrinsic semiconductor, the valency of the donor impurity is …………..
The rays of different colours fail to converge at a point after passing through a thick converging lens. The defect is called
When a bus is cilmbing on hilly road, a standing passenger, balances himself by keeping legs apart to achieve balance by keeping C.G. _______________ .
For which of the following objects will the centre of mass NOT be at their geometrical centre?
(I) An egg
(II) a cylindrical box full of rice
(III) a cubical box containing assorted sweets
(I) An egg
(II) a cylindrical box full of rice
(III) a cubical box containing assorted sweets
A block of mass $m$ moving on a frictionless surface at speed $V$ collides elastically with a block of same mass, initially at rest. Now the first block moves at an angle $\theta$ with its initial direction and has speed $V_1$. The speed of the second block after collision is
→