A particle of mass 10g moves along a circle of radius 6.4 cm with a constant tangential acceleration. What is the magnitude of this acceleration, if the kinetic energy of the particle becomes equal to 8x10-4 J by the end of the second revolution after the beginning of the motion?

(1) 0.15 m/s2

(2) 0.18 m/s2

(3) 0.2 m/s2

(4) 0.1 m/s2

Subtopic:  Circular Motion |
From NCERT
NEET - 2016
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In the given figure, $$a=15$$ m/s2 represents the total acceleration of a particle moving in the clockwise direction in a circle of radius $$R=2.5$$ m at a given instant of time. The speed of the particle is:

1. $$4.5$$ m/s
2. $$5.0$$ m/s
3. $$5.7$$ m/s
4. $$6.2$$ m/s

Subtopic:  Circular Motion |
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A particle moves so that its position vector is given by, $$\overrightarrow{r}=\cos \omega t ~\hat{x}+ \sin \omega t~ \hat{y},$$ where $$\omega$$ is a constant. Which of the following is true?
 1 velocity and acceleration both are parallel to $$\overrightarrow{r}.$$ 2 velocity is perpendicular to $$\overrightarrow{r}$$ and acceleration is directed towards to origin. 3 velocity is parallel to $$\overrightarrow{r}$$ and acceleration is directed away from the origin. 4 velocity and acceleration both are perpendicular to $$\overrightarrow{r}.$$
Subtopic:  Circular Motion |
78%
From NCERT
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A particle of mass $$10$$ g moves along a circle of radius $$6.4$$ cm with a constant tangential acceleration. What is the magnitude of this acceleration, if the kinetic energy of the particle becomes equal to $$8 \times 10^{-4}$$ J by the end of the second revolution after the beginning of the motion?
 1 $$0.15$$ m/s2 2 $$0.18$$ m/s2 3 $$0.2$$ m/s2 4 ​​​​​​$$0.1$$ m/s2
Subtopic:  Circular Motion |
53%
From NCERT
NEET - 2016
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