MCQ
The retarding acceleration of $7.35\, ms^{-2}$ due to frictional force stops the car of mass $400\, kg$ travelling on a road. The coefficient of friction between the tyre of the car and the road is
- A$0.55$
- ✓$0.75$
- C$6.70$
- D$0.65$
✓
Answer
Correct option: B.
$0.75$
b
$\begin{array}{l}
As\,we\,know,coefficient\,of\,friction\,\mu = \frac{F}{N}\\
\Rightarrow \mu = \frac{{ma}}{{mg}} = \frac{a}{g}\left( {a = 7.35m{s^{ - 2}}\,given} \right)\\
\therefore \mu = \frac{{7.35}}{{9.8}} = 0.75
\end{array}$
$\begin{array}{l}
As\,we\,know,coefficient\,of\,friction\,\mu = \frac{F}{N}\\
\Rightarrow \mu = \frac{{ma}}{{mg}} = \frac{a}{g}\left( {a = 7.35m{s^{ - 2}}\,given} \right)\\
\therefore \mu = \frac{{7.35}}{{9.8}} = 0.75
\end{array}$
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 particle travels half of the distance of a straight journey with a speed $6 \,m / s$. The remaining part of the distance is covered with speed $2 \,m / s$ for half of the time of remaining journey and with speed $4 \,m / s$ for the other half of time. The average speed of the particle is ....... $m / s$
→If the frequency of an object in uniform circular motion is doubled, its acceleration becomes
If time taken by the projectile to reach $Q$ is $T$, then $PQ$ =
→Correct pair is ..........
A mass of material exists in its solid format its melting temperature $0\,^o C$. The following processes then occur to the material
→Process $-1$:An amount of thermal energy $Q$ is added to the material and $\frac{2}{3}$ of the material melts.
Process $-2$:An identical additional amountof thermal energy $Q$ is added to the materlal is now a liquid at $4\,^o C$
........ $^oC$ is the ratio of the latent heat of fusion to the specific heat of the liquid for this material.
A girl sitting on a swing and swinging. If a girl stands on the swing what will be the effect on the period of oscillation of the swing?
The value of the sum of two vectors $\overrightarrow A $ and $\overrightarrow B $ with $\theta $ as the angle between them is
→The rotation of earth about its axis is:
→- Periodic motion.
- Simple harmonic motion.
- Periodic but not simple harmonic motion.
- Non$-$periodic motion.
A rod of length $3\, m$ and its mass per unit length is directly proportional to the distance $x$ from its one end. The center of gravity of the rod from that end will be at ........ $ m$
→Aboat having a speed of $5\,\, km/hr$. in still water, crosses a river of width $1\,\, km$ along the shortest possible path in $15 \,\,minutes$. The speed of the river in $Km/hr.$
→