# Three girls skating on a circular ice ground of radius $$200$$ m start from a point $$P$$ on the edge of the ground and reach a point $$Q$$ diametrically opposite to $$P$$ following different paths as shown in the figure. The correct relationship among the magnitude of the displacement vector for three girls will be:        1. $$A > B > C$$ 2. $$C > A > B$$ 3. $$B > A > C$$ 4. $$A = B = C$$

Subtopic:  Position & Displacement |
84%
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Rain is falling vertically with a speed of $$30$$ m/s. A woman rides a bicycle with a speed of $$10$$ m/s in the north to south direction. What is the direction in which she should hold her umbrella? [Given: $$\tan 16^{\circ}= 0.29, \& \tan 18^{\circ}= 0.33]$$

 1 $$16^{\circ}$$ with the vertical, towards north 2 $$18^{\circ}$$ with the vertical, towards north 3 $$16^{\circ}$$ with the vertical, towards south 4 $$18^{\circ}$$ with the vertical, towards south
Subtopic:  Relative Motion |
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A stone tied to the end of a string $$80$$ cm long is whirled in a horizontal circle at a constant speed. If the stone makes $$14$$ revolutions in $$25$$ s, what is the magnitude of the acceleration of the stone?

 1 $$8.1$$ ms–2 2 $$7.7$$ ms–2 3 $$8.7$$ ms–2 4 $$9.9$$ ms–2
Subtopic:  Circular Motion |
66%
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Which one of the following is not true?

 1 The net acceleration of a particle in a circular motion is always along the radius of the circle towards the centre. 2 The velocity vector of a particle at a point is always along the tangent to the path of the particle at that point. 3 The acceleration vector of a particle in uniform circular motion averaged over one cycle is a null vector. 4 None of the above.
Subtopic:  Circular Motion |
60%
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A particle starts from the origin at $$t=0$$ sec with a velocity of $$10\hat j~\text{m/s}$$ and moves in the $$x\text-y$$ plane with a constant acceleration of $$(8.0\hat i +2.0 \hat j)~\text{m/s}^2$$. At what time is the $$x\text-$$coordinate of the particle $$16$$ m?

 1 $$2$$ s 2 $$3$$ s 3 $$4$$ s 4 $$1$$ s

Subtopic:  Uniformly Accelerated Motion |
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For any arbitrary motion in space, which of the following relations is true?

 1 $$\overrightarrow{v}_{\text {avg }}=\left(\frac{1}{2}\right)\left[\overrightarrow{v}\left(t_1\right)+\overrightarrow{v}\left(t_2\right)\right]$$ 2 $$\overrightarrow{v}(t)=\overrightarrow{v}(0)+\overrightarrow{a} t$$ 3 $$\overrightarrow{r}({t})=\overrightarrow{r}(0)+\overrightarrow{v}(0){t}+\frac{1}{2} \overrightarrow{a}{t}^2$$ 4 $$\overrightarrow{v}_{\text {avg }}=\frac{\left[\overrightarrow{r}\left(t_2\right)-\overrightarrow{r}\left(t_1\right)\right]}{\left(t_2-t_1\right)}$$

Subtopic:  Speed & Velocity |
63%
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A particle is moving along a circle such that it completes one revolution in $$40$$ seconds. In $$2$$ minutes $$20$$ seconds, the ratio of $$|displacement| \over distance$$ will be:
1. $$0$$
2. $$\frac{1}{7}$$
3. $$\frac{2}{7}$$
4. $$\frac{1}{11}$$

Subtopic:  Position & Displacement |
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Consider the motion of the tip of the second hand of a clock. In one minute (assuming $$R$$ to be the length of the second hand), its:

 1 displacement is $$2\pi R$$ 2 distance covered is $$2R$$ 3 displacement is zero. 4 distance covered is zero.
Subtopic:  Position & Displacement |
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A person, reaches a point directly opposite on the other bank of a flowing river, while swimming at a speed of $$5$$ m/s at an angle of $$120^\circ$$ with the flow. The speed of the flow must be:
1. $$2.5$$ m/s
2. $$3$$ m/s
3. $$4$$ m/s
4. $$1.5$$ m/s

Subtopic:  Relative Motion |
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A car with a vertical windshield moves in a rain storm at a speed of $$40$$ km/hr. The rain drops fall vertically with a constant speed of $$20$$ m/s. The angle at which raindrops strike the windshield is:
1. $$\tan^{- 1} \frac{5}{9}$$
2. $$\tan^{- 1} \frac{9}{5}$$
3. $$\tan^{- 1} \frac{3}{2}$$
4. $$\tan^{- 1} \frac{2}{3}$$

Subtopic:  Relative Motion |
61%
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