A rod of weight $$w$$ is supported by two parallel knife edges, A and B, and is in equilibrium in a horizontal position. The knives are at a distance $$d$$ from each other. The centre of mass of the rod is at a distance $$x$$ from A. The normal reaction to A is:
1. $$wx \over d$$
2. $$wd \over x$$
3. $$w(d-x) \over x$$
4. $$w(d-x) \over d$$

Subtopic:  Torque |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

An automobile moves on a road with a speed of 54 kmh-1. The radius of its wheels is 0.45 m and the moment of inertia of the wheel about its axis of rotation is 3 kg-m2. If the vehicle is brought to rest in 15 s, the magnitude of average torque transmitted by its brakes to the wheel is:

1. 6.66 kg m2 s-2

2. 8.58 kg m2 s-2

3. 10.86 kg m2 s-2

4. 2.86 kg m2 s-2

Subtopic:  Torque |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in the figure. When the string is cut, the initial angular acceleration of the rod is:

1. g/L
2. 2g/L
3. 2g/3L
4. 3g/2L

Subtopic:  Torque |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

ABC is an equilateral triangle with O as its centre. F1, F2, and F3 represent three forces acting along the sides AB, BC and AC respectively. If the total torque about O is zero, then the magnitude of F3 is:

1. ${\mathrm{F}}_{1}+{\mathrm{F}}_{2}$

2. ${\mathrm{F}}_{1}-{\mathrm{F}}_{2}$

3. $\frac{{\mathrm{F}}_{1}+{\mathrm{F}}_{2}}{2}$

4. $2\left(\mathrm{F}+{\mathrm{F}}_{2}\right)$

Subtopic:  Torque |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

If $\stackrel{\to }{\mathrm{F}}$ is the force acting on a particle having position vector $\stackrel{\to }{r}$ and $\stackrel{\to }{\tau }$ be the torque of this force about the origin, then:

1. $\stackrel{\to }{r}$. $\stackrel{\to }{\tau }$≠ 0 and $\stackrel{\to }{F}$. $\stackrel{\to }{\tau }$ = 0

2. $\stackrel{\to }{r}$. $\stackrel{\to }{\tau }$> 0 and $\stackrel{\to }{F}$. $\stackrel{\to }{\tau }$< 0

3. $\stackrel{\to }{r}$. $\stackrel{\to }{\tau }$ = 0 and $\stackrel{\to }{F}$. $\stackrel{\to }{\tau }$ = 0

4. $\stackrel{\to }{r}$. $\stackrel{\to }{\tau }$= 0 and $\stackrel{\to }{F}$. $\stackrel{\to }{\tau }$≠ 0

Subtopic:  Torque |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

A uniform rod of length l and mass M is free to rotate in a vertical plane about A. The rod, initially in the horizontal position, is released. The initial angular acceleration of the rod is: (Moment of inertia of the rod about A is$\frac{{\mathrm{Ml}}^{2}}{3}$)

1. $\frac{3g}{2l}$

2. $\frac{2l}{3g}$

3. $\frac{3g}{2{l}^{2}}$

4. $mg\frac{1}{2}$

Subtopic:  Torque |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh