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Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.PowerMedium2 minQB

PhysicsMediummultiple choice

Figure shows an ideal spring block system, force constant of spring is k which has been compressed by an amount $x_{0}$ . If x is instantaneous deflection of spring from its natural length, mark the correct option(s).

Options:(select one or more)

Answer:

A, B, C

Solution:

Released from compression $x_{0}$ : speed at deflection x is $v = \frac{k}{m} (x_{0}^{2} - x^{2})$ .

Power: $P = k xv = k x \frac{k ( x _{0}^{2} - x ^{2} )}{m}$ (A correct). Maximising $P^{2} \propto x^{2} (x_{0}^{2} - x^{2})$ gives $x = x_{0} / 2$ (C correct, D wrong), and

$P_{ma x} = \frac{k x _{0}^{2}}{2} \frac{k}{m}$

(B correct). Ans. (A,B,C)

Stream:JEESubject:PhysicsTopic:W.E.P.Subtopic:Power

⏱ 2mℹ️ Source: QB

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