Question
A block of mass $M$ placed inside a box descends vertically with acceleration $'a'$. The block exerts a force equal to one-fourth of its weight on the floor of the box. The value of $'a'$ will be .............
✓
Answer
$m g-N=m a$
$a=g-\frac{g}{4}$
$a=\frac{3 g}{4}$
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
To find the resistance of a galvanometer by the half deflection method the following circuit is used with resistances $R_1 = 9970\,\Omega,$ $R_2 = 30\,\Omega$ and $R_3 = 0\,\Omega.$ The deflection in the galvanometer is $d$. With $R_3 = 107\,\Omega$ the deflection changed to $\frac {d}{2}$The galvanometer resistance is approximately ............... $\Omega$
→'$n$' moles of an ideal gas undergoes a process $A \rightarrow B$ as shown in the figure. The maximum temperature of the gas during the process will be
→Which sequence represents the best synthesis of hexanal ?
→$\underset{Hexanal}{\mathop{C{{H}_{3\text{ }}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}CH=O}}\,$
A particle executes simple harmonic motion and is located at $x = a, b$ and $c$ at times $t_0, 2t_0$ and $3t_0$ respectively. The frequency of the oscillation is
→A body of weight $2\, kg$ is suspended as shown in the figure. The tension ${T_1}$ in the horizontal string (in kg wt) is
→In the following common emitter circuit if $\beta = 100, V_{CE} = 7V, V_{BE} =$ Negligible $R_C = 2 k \Omega$ then $I_B = ?$....$mA$
→The angular velocity of the earth at present in $\omega $ . With what angular velocity should it rotate so that weight of body at the equator appears to be zero ? ....... $\omega $
→Deutron and $\alpha - $ particle are put $1\,\mathop A\limits^o $ apart in air. Magnitude of intensity of electric field due to deutron at $\alpha - $ particle is
→A water drop takes the shape of a sphere in a oil while the oil drop spreads in water, because
→($A.F.$ = adhesive force, $C.F.$ = cohesive force)
Find the number of photons emitted per second from of source of light which results in a photocurrent with drift velocity of $1.5\ m/s$ in a conductor with cross-section area $0.25\ m^2$ , volume density of electrons $10^{20}\ per \ m^3$ , (Assume that $60\%$ of photons emitted result in electron emission)
→