Physics Crash Course MHT-CET>Chapter 1 - Motion in a Plane>Exercise 1>Q 129

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If the angle between tangential acceleration and resultant acceleration in non-U.C.M.(non uniform circular motion) is $α$ , then direction of the resultant acceleration will be,

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Important Questions on Motion in a Plane

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Physics Crash Course MHT-CET>Chapter 1 - Motion in a Plane>Exercise 1>Q 130

A car is moving along a circular road at a speed of

20 m s^{- 1}

. The radius of circular road is

10 m

. If the speed is increased at a rate of

30 m s^{- 2}

, what is the resultant acceleration at that moment?

EASY

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Physics Crash Course MHT-CET>Chapter 1 - Motion in a Plane>Exercise 1>Q 131

Select the wrong statement.

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Physics Crash Course MHT-CET>Chapter 1 - Motion in a Plane>Exercise 1>Q 132

For a particle in a non-uniform circular motion, identify the correct statement.

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Physics Crash Course MHT-CET>Chapter 1 - Motion in a Plane>Exercise 1>Q 133

A wheel is

0.25 m

in radius. When it makes

15

revolutions per minute, its linear speed at a point on the circumference is

EASY

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Physics Crash Course MHT-CET>Chapter 1 - Motion in a Plane>Exercise 1>Q 134

What is the value of linear velocity if

\vec{ω} = 3 \hat{i} - 4 \hat{j} + \hat{k}

and

\vec{r} = 5 \hat{i} - 6 \hat{j} + 6 \hat{k} ?

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Physics Crash Course MHT-CET>Chapter 1 - Motion in a Plane>Exercise 1>Q 135

Assertion: In a uniform circular motion, the centripetal and centrifugal forces acting in opposite direction balances each other.

Reason: Centripetal and centrifugal forces don't act at the same time.

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Physics Crash Course MHT-CET>Chapter 1 - Motion in a Plane>Exercise 1>Q 136

A turn-table which is rotating uniformly has a particle placed on it. As seen from the ground, the particle goes in a circle with speed

20 cm s^{- 1}

and acceleration

20 cm s^{- 2}

. The particle is now shifted to a new position where radius is half of the original value. The new values of speed and acceleration will be,

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Physics Crash Course MHT-CET>Chapter 1 - Motion in a Plane>Exercise 1>Q 137

A body is revolving with a constant speed along a circle. If its direction of motion is reversed but the speed remains the same, then which of the following statements is true?