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Standard XII

Physics

Relation between Linear and Angular Speed

Assertion :Sp...

Question

Assertion :Speed of a particle moving in a circle varies with time as, $v = (4 t - 12)$ . Such type of circular motion is not possible. Reason: Speed cannot change linearly with time.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion is incorrect and Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
If speed is directly proportional to time, circular motion is not possible without an external inward force that varies in proportion to $t^{2}$ . Reason states that speed cannot vary linearly, which is not true in case of a tied object.

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Similar questions

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

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Assertion :Speed of a particle moving in a circle varies with time as, v=(4t−12). Such type of circular motion is not possible. Reason: Speed cannot change linearly with time.

The correct option is C Assertion is correct but Reason is incorrectIf speed is directly proportional to time, circular motion is not possible without an external inward force that varies in proportion to t2. Reason states that speed cannot vary linearly, which is not true in case of a tied object.

Assertion :Speed of a particle moving in a circle varies with time as, $v = (4 t - 12)$ . Such type of circular motion is not possible. Reason: Speed cannot change linearly with time.