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Q. No.The position of a particle is given by; \(\vec r(t)=4t\hat i+2t^2\hat j+5\hat k,\) where \(t\) is in seconds and \(r\) in metres. Find the magnitude and direction of the velocity \(v(t)\), at \(t=1~\text{s},\) with respect to the \(x\text-\)axis.
1. \(4\sqrt2~\text{ms}^{-1},45^\circ\)
2. \(4\sqrt2~\text{ms}^{-1},60^\circ\)
3. \(3\sqrt2~\text{ms}^{-1},30^\circ\)
4. \(3\sqrt2~\text{ms}^{-1},45^\circ\)
Subtopic: Speed & Velocity |
81%
From NCERT
NEET - 2023
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A ball is projected from point \(A\) with velocity \(20\) ms–1 at an angle \(60^\circ\) to the horizontal direction. At the highest point \(B\) of the path (as shown in figure), the velocity \(v\) (in ms–1) of the ball will be:
| 1. | \(20\) | 2. | \(10\sqrt3\) |
| 3. | zero | 4. | \(10\) |
Subtopic: Projectile Motion |
70%
From NCERT
NEET - 2023
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A particle is executing uniform circular motion with velocity \(\vec v\) and acceleration \(\vec a.\) Which of the following is true?
| 1. | \(\vec v\) is a constant; \(\vec a\) is not a constant. |
| 2. | \(\vec v\) is not a constant; \(\vec a\) is not a constant. |
| 3. | \(\vec v\) is a constant; \(\vec a\) is a constant. |
| 4. | \(\vec v\) is not a constant; \(\vec a\) is a constant. |
Subtopic: Circular Motion |
65%
From NCERT
NEET - 2023
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A bullet is fired from a gun at the speed of \(280~\text{ms}^{-1}\) in the direction \(30^\circ\) above the horizontal. The maximum height attained by the bullet is:\(\left(g=9.8~\text{m/s}^{2}, \sin30^{\circ}=0.5\right)\)
| 1. | \(3000~\text{m}\) | 2. | \(2800~\text{m}\) |
| 3. | \(2000~\text{m}\) | 4. | \(1000~\text{m}\) |
Subtopic: Projectile Motion |
66%
From NCERT
NEET - 2023
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A cricket ball is thrown by a player at a speed of \(20\) m/s in a direction \(30^\circ\) above the horizontal. The maximum height attained by the ball during its motion is: (Take \(g=10\) m/s2)
1. \(5\) m
2. \(10\) m
3. \(20\) m
4. \(25\) m
1. \(5\) m
2. \(10\) m
3. \(20\) m
4. \(25\) m
Subtopic: Projectile Motion |
76%
From NCERT
NEET - 2022
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Rain is falling vertically downward with a speed of \(35~\text{m/s}.\) The wind starts blowing after some time with a speed of \(12~\text{m/s}\) in the east to the west direction. The direction in which a boy standing at the place should hold his umbrella is:
| 1. | \(\text{tan}^{-1}\Big(\frac{12}{37}\Big)\) with respect to rain |
| 2. | \(\text{tan}^{-1}\Big(\frac{12}{37}\Big)\) with respect to wind |
| 3. | \(\text{tan}^{-1}\Big(\frac{12}{35}\Big)\) with respect to rain |
| 4. | \(\text{tan}^{-1}\Big(\frac{12}{35}\Big)\) with respect to wind |
Subtopic: Relative Motion |
71%
From NCERT
NEET - 2022
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A ball is projected with a velocity of \(10~\text{m/s}\) at an angle of \(60^\circ\) with the vertical direction. Its speed at the highest point of its trajectory will be:
1. \(10~\text{m/s}\)
2. zero
3. \(5\sqrt{3}~\text{m/s}\)
4. \(5~\text{m/s}\)
1. \(10~\text{m/s}\)
2. zero
3. \(5\sqrt{3}~\text{m/s}\)
4. \(5~\text{m/s}\)
Subtopic: Projectile Motion |
61%
From NCERT
NEET - 2022
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A particle moving with uniform speed in a circular path maintains:
| 1. | constant acceleration |
| 2. | constant velocity but varying acceleration |
| 3. | varying velocity and varying acceleration |
| 4. | constant velocity |
Subtopic: Circular Motion |
59%
From NCERT
NEET - 2024
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For a smoothly running analog clock, the ratio of the number of rotations made in a day by the hour hand to the second hand, respectively, is:
| 1. | \(24 :1\) | 2. | \(1:720\) |
| 3. | \(1:60\) | 4. | \(2:5\) |
Subtopic: Circular Motion |
66%
From NCERT
NEET - 2024
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A particle moving in a circle of radius \(R\) with a uniform speed takes a time \(T\) to complete one revolution. If this particle were projected with the same speed at an angle \(\theta\) to the horizontal, the maximum height attained by it equals \(4R.\) The angle of projection, \(\theta\) is then given by:
| 1. | \( \theta=\sin ^{-1}\left(\frac{\pi^2 {R}}{{gT}^2}\right)^{1/2}\) | 2. | \(\theta=\sin ^{-1}\left(\frac{2 {gT}^2}{\pi^2 {R}}\right)^{1 / 2}\) |
| 3. | \(\theta=\cos ^{-1}\left(\frac{{gT}^2}{\pi^2 {R}}\right)^{1 / 2}\) | 4. | \(\theta=\cos ^{-1}\left(\frac{\pi^2 {R}}{{gT}^2}\right)^{1 / 2}\) |
Subtopic: Projectile Motion |
71%
From NCERT
NEET - 2021
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