Question:
Two blocks of masses 8 kg and 5 kg are connected with a rod of mass 3 kg (see figure). The upper block is pulled up with a force of 180 N. The tension in the rod in contact with the upper block is
Two blocks of masses 8 kg and 5 kg are connected with a rod of mass 3 kg (see figure). The upper block is pulled up with a force of 180 N. The tension in the rod in contact with the upper block is
Updated On: Aug 13, 2024
- 22.5 N
- 45 N
- 90 N
- 180 N
Hide Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Let the acceleration of the system be a
Then (8 + 3 + 5) a = 180 - 16 $\times$ 10 = 20
That is, $a = \frac{20}{16} = \frac{5}{4} m/s$
Tension at P = (3 + 5) $\times$ (g + a) = (3 + 5) $\left( 10 + \frac{5}{4} \right) = 90 \, N$
Was this answer helpful?
6
9
Top Questions on tension
A body of mass 1kg is suspended with the help of two strings making angles as shown in the figure. Magnitude of tensions $ T_1 $ and $ T_2 $, respectively, are (in N):
- Tension of a rope when a man of mass \( m \) climbs up or down with an acceleration \( a<g \)?
- In a vertical circle of radius r, at what point in its path does a particle have tension equal to zero if it is just able to complete the vertical circle?
- A bob is whirled in a horizontal plane by means of a string with an initial speed of ω rpm. The tension in the string is T. If speed becomes 2ω while keeping the same radius, the tension in the string becomes:
- If the length of a string is \(P\) when the tension in it is 6 N and its length is \(Q\) when the tension in it is 8 N, then the original length of the string is:
View More Questions
Notes on tension
Concepts Used:
Tension
A force working along the length of a medium, especially if this force is carried by a flexible medium like cable or rope is called tension. The flexible cords which bear muscle forces to other parts of the body are called tendons.
Net force = 𝐹𝑛𝑒𝑡 = 𝑇−𝑊=0,
where,
T and W are the magnitudes of the tension and weight and their signs indicate a direction, be up-front positive here.
Read More: Tension Formula