Q. No.Which of the following is the angle between velocity and acceleration of a body in uniform circular motion?
1. \(30^\circ\)
2. \(45^\circ\)
3. \(60^\circ\)
4. \(90^\circ\)
| 1. | \(\dfrac{{v}^{2}}{r}\) | 2. | \(a\) |
| 3. | \(\sqrt{{a}^{2}{+}{\left({\dfrac{{v}^{2}}{r}}\right)}^{2}}\) | 4. | \(\sqrt{a+\dfrac{v^{2}}{r}}\) |
| 1. | \(2:\sqrt3\) | 2. | \(\sqrt3:2 \) |
| 3. | \(\sqrt3:1\) | 4. | \(1:\sqrt{3}\) |
1. \(\frac{3K_0}{r}\)
2. \(\frac{4K_0}{r}\)
3. \(\frac{2K_0}{r}\)
4. \(\frac{K_0}{r}\)
The angle turned by a body undergoing circular motion depends on time as . Then the angular acceleration of the body is
(1) θ1
(2) θ2
(3) 2θ1
(4) 2θ2
A particle moves in a circle of radius 5 cm with constant speed and time period sec. The acceleration of the particle is:
1. 25 m/s2
2. 36 m/s2
3. 5 m/s2
4. 15 m/s2
A particle moves in a circle of radius \(5\) cm with constant speed and time period \(0.2\pi\) s. The acceleration of the particle is:
1.
2.
3.
4.
| 1. | \( \vec{v}_A=3 \hat{j}~\text{m/s} ;~\vec{a}_A=-9 \hat{i}~\text{m/s}^2\) |
| 2. | \( \vec{v}_A=-3 \hat{j}~\text{m/s};~\vec{a}_A=9 \hat{i}~\text{m/s}^2\) |
| 3. | \(\vec{v}_A=-3 \hat{i}~~\text{m/s};\vec{a}_A=9 \hat{j}~\text{m/s}^2\) |
| 4. | \(\vec{v}_A=3 \hat{i}~\text{m/s} ;~\vec{a}_A=9 \hat{j}~\text{m/s}^2 \) |
The angular speed of a fly wheel making \(120\) revolutions/minute is:
1. \(2\pi~\mathrm{rad/s}\)
2. \(4\pi^2~\mathrm{rad/s}\)
3. \(\pi~\mathrm{rad/s}\)
4. \(4\pi~\mathrm{rad/s}\)
A particle moves along a circular path of radius \(9~\text{m}\) and completes \(120\) revolutions in \(3\) minutes. What is the centripetal acceleration of the particle?
1. \(8 \pi^2 ~\text{m/s}^2\)
2. \(16 \pi^2~\text{m/s}^2\)
3. \(32 \pi^2~\text{m/s}^2\)
4. \(16 \pi ~\text{m/s}^2\)
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