MCQ
........ $N$ the maximum force for which both the block will move with same acceleration.
- A$16$
- B$32$
- ✓$48$
- D$8$
✓
Answer
Correct option: C.
$48$
c
Pseudo force on 4 kg block $=\mathrm{ma}$
Pseudo force on 4 kg block $=\mathrm{ma}$
$\therefore \mathrm{ma}=\mu \mathrm{mg} \Rightarrow \mathrm{a}=0.4 \times 10=4 \mathrm{m} / \mathrm{s}^{2}$
as both the blocks will move with same
acc$”a”$
${F=(4+8) a}$
${=12 \times 4=48 \mathrm{N}}$
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 soldier with a machine gun, falling from an alrplane gets detached from his parachute. He is able to resist the downward acceleration, if he shoots $40$ bullets a second at the speed of $500 \,m / s$. If the weight of a bullet is $49 \,g$, the weight of the man .......... $ \,kg$ with the gun? Ignore resistance due to air and assume the acceleration due to gravity, $g=9.8 \,ms ^{-2}$.
→If the speed $v$ of the bob in a simple pendulum is plotted against the tangential acceleration $a$, the correct graph will be represented by
→The breaking stress of a wire depends upon
values $2.71$ and $3.70$ ohm at $10°C$ and $100°C.$ The temperature at which the resistance is $3.26$ ohm is .......... $^oC$
→For the $P-V$ diagram given for an ideal gas, out of the following which one correctly represents the $T-P$ diagram ?
→Two paper screens $A$ and $B$ are separated by a distance of $100\,m$. A bullet pierces $A$ and then $B$. The hole in $B$ is $10\,cm$ below the hole in $A$. If the bullet is travelling horizontally at the time of hitting $A$, then the velocity of the bullet at $A$ is $.......\,m / s$
→In the following figure, the object of mass $m$ is held at rest by a horizontal force as shown. The force exerted by the string on the block is
→Two masses $m_1\, \& m_2$ are initially at rest and are separated by a very large distance. If the masses approach each other subsequently, due to gravitational attraction between them, their relative velocity of approach at a separation distance of $d$ is :
→The term 'fluid' is used for ............
Sometimes it is convenient to construct a system of units so that all quantities can be expressed in terms of only one physical quantity. In one such system, dimensions of different quantities are given in terms of a quantity $X$ as follows: [position $]=\left[X^\alpha\right] ;[$ speed $]=\left[X^\beta\right]$; [acceleration $]=\left[X^{ p }\right]$; [linear momentum $]=\left[X^{ q }\right]$; [force $]=\left[X^{ I }\right]$. Then -
→$(A)$ $\alpha+p=2 \beta$
$(B)$ $p+q-r=\beta$
$(C)$ $p-q+r=\alpha$
$(D)$ $p+q+r=\beta$