A spring balance A reads 2 ,kg with a block of mass m suspended from it. Another balance B reads 3 ,

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4-1.Newton's Laws of Motion

medium

A spring balance $A$ reads $2 \,kg$ with a block of mass $m$ suspended from it. Another balance $B$ reads $3 \,kg$ when a beaker with a liquid is put on its pan. The two balances are now so arranged that the hanging mass $m$ is fully immersed inside the liquid in the beaker as shown in the figure given below.In this situation,

the balance $A$ will read $2 \,kg$ and $B$ will read $5 \,kg$

the balance $A$ will read $2 \,kg$ and $B$ will read $3 \,kg$

the balance $A$ will read less than $2 \,kg$ and $B$ will read between $3 \,kg$ and $5 \,kg$

the balance $A$ will read less than $2 \,kg$ and $B$ will read $3 \,kg$

(KVPY-2009)

Solution

(c)

When block is dipped in water, it displaces some water which exerts buoyant force on block. As a result, reading on scale $A$ will be lower than $2 \,kg$. Due to reaction of block (which is equal to buoyant force), beaker of water is pushed. So, reading of scale $B$ will be more than $3 \,kg$.

Standard 11

Physics

Figure shows two cases. In first case a spring (spring constant $K$ ) is pulled by two equal and opposite forces $F$ at both ends and in second case is pulled by a force $F$ at one end. Extensions $(x)$ in the springs will be

medium

In the setup shown, a $200\, N$ block is supported in equilibrium with the help of strings and a spring. A point $O$, the strings knotted. Extension in the spring is $4\, cm$. Force constant of the spring is closest to ………… $N/m$ $[g = 10\, m/s^2]$

medium

Find the reading of spring balance as shown in figure. Assume that mass $M$ is in equilibrium. All surfaces are smooth ……. $N$

hard

Two masses of $1\,kg$ and $2\,kg$ respectively are connected by a massless spring as shown in figure. A force of $20\,N$ acts on the $2\,kg$ mass at the instant when the $1\, kg$ mass has an acceleration of $10\,ms^{-2}$ towards right, the acceleration of the $2\,\,kg$ mass is ……… $ms^{-2}$

medium

Two blocks $1$ and $2$ of equal mass $m$ are connected by an ideal string (see figure below) over a frictionless pulley. The blocks are attached to the ground by springs having spring constants $k_1$ and $k_2$ such that $k_1 > k_2$. Initially, both springs are unstretched. Block $1$ is slowly pulled down a distance $x$ and released. Just after the release the possible values of the magnitudes of the accelerations of the blocks $a_1$ and $a_2$ can be

hard

(KVPY-2012)

Solution

Similar Questions

Figure shows two cases. In first case a spring (spring constant $K$ ) is pulled by two equal and opposite forces $F$ at both ends and in second case is pulled by a force $F$ at one end. Extensions $(x)$ in the springs will be

In the setup shown, a $200\, N$ block is supported in equilibrium with the help of strings and a spring. A point $O$, the strings knotted. Extension in the spring is $4\, cm$. Force constant of the spring is closest to ………… $N/m$ $[g = 10\, m/s^2]$

Find the reading of spring balance as shown in figure. Assume that mass $M$ is in equilibrium. All surfaces are smooth ……. $N$

Two masses of $1\,kg$ and $2\,kg$ respectively are connected by a massless spring as shown in figure. A force of $20\,N$ acts on the $2\,kg$ mass at the instant when the $1\, kg$ mass has an acceleration of $10\,ms^{-2}$ towards right, the acceleration of the $2\,\,kg$ mass is ……… $ms^{-2}$

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