MCQ
Figure shows a heavy block kept on a frictionless surface and being pulled by two ropes of equal mass $m.$ At $t = 0$, the force on the left rope is withdrawn but the
force on the right end continues to act. Let $F_1$ and $F_2$ be the magnitudes of the forces by the right rope and the left rope on the block respectively:
  • $F_1=F_2=F$ for $t<0$.
  • B
    $F_1=F_2=F+m g$ for $t<0$.
  • C
    $F_1=F, F_2=F$ for $t>0$.
  • D
    $F_10$.

Answer

Correct option: A.
$F_1=F_2=F$ for $t<0$.
At $t < 0$, the block is in equilibrium in the horizontal direction.
So, $F_1 = F_2 = F$
At $t > 0, F_2= 0$ and $F_1= F.$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

While measuring the thermal conductivity of a liquid, we keep the upper part hot and lower part cool, so that
A $5cm$ thick ice block is there on the surface of water in a lake. The temperature of air is $-10°C$ ; how much time it will take to double the thickness of the block ......  hour ($L = 80 cal/g, Kicc = 0.004 Erg/s-k, dice = 0.92 g cm^{-3}$)
When two particles collide elastically, then impulsive force can't change
If the value of resistance is $10.845 \,ohm$ and the value of current is $3.23 \,amp$, the value of potential with significant numbers would be ........... $volt$
One mole of a gas expands obeying the relation as shown in the $P/V$ diagram. The maximum temperature in this process is equal to
Which of the following group have different dimension
At the top of the trajectory of a projectile, the directions of its velocity and acceleration are
A cannon ball is fired with a velocity $200\, m/sec$ at an angle of $60° $ with the horizontal. At the highest point of its flight it explodes into $3$ equal fragments, one going vertically upwards with a velocity $100 \,m/sec$, the second one falling vertically downwards with a velocity $100\, m/sec$. The third fragment will be moving with a velocity
Two vibrating strings of the same material but lengths $L$ and $2L$ have radii $2r$ and $r$ respectively. They are stretched under the same tension. Both the strings vibrate in their fundamental modes, the one of length $L$ with frequency $n_1$ and the other with frequency $n_2$. The ratio $n_1/n_2$ is given by
Suppose a container ia evacuated to leave just one molecule of a gas in it. Let $\mathrm{V}_{\mathrm{a}}$ and $\mathrm{v}_{\mathrm{rms}}$ represent the average speed and the $\text{rms}$ speed of the gas.