AP EAMCET · PHYSICS · Work Power Energy
The kinetic energy of a car is doubled when its velocity is increased by \(1 \mathrm{~ms}^{-1}\). Then the initial velocity of the car is
- A \((2+\sqrt{2}) \mathrm{ms}^{-1}\)
- B \((1-\sqrt{2}) \mathrm{ms}^{-1}\)
- C \((2-\sqrt{2}) \mathrm{ms}^{-1}\)
- D \((1+\sqrt{2}) \mathrm{ms}^{-1}\)
Answer & Solution
Correct Answer
(D) \((1+\sqrt{2}) \mathrm{ms}^{-1}\)
Step-by-step Solution
Detailed explanation
Let initial velocity \(=\mathrm{v}\) When velocity is increases by \(1 \mathrm{~m} / \mathrm{s}\) \(\mathrm{v}^{\prime}=\mathrm{v}+1\) then \(\mathrm{KE}=2 \mathrm{E}\) \(\frac{2 \mathrm{E}}{\mathrm{E}}=\frac{\frac{1}{2} \mathrm{~m}(\mathrm{v}+1)^2}{\frac{1}{2} \mathrm{mv}^2}\)…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from PHYSICS
- A wire of length 20 cm is placed horizontally on the surface of water and is gently pulled up with a force of \(1.456 \times 10^{-2} \mathrm{~N}\) to keep the wire in equilibrium. The surface tension of water isAP EAMCET 2025 Easy
- In common emitter amplifier of a transistor, if the ratio of the voltage gain and current amplification factor is 4, then the ratio of the collector and base resistances isAP EAMCET 2025 Medium
- Which of the following statements are true in the context of a Compound Microscope?
(A) Each lens produces a virtual and inverted image.
(B) The objective has a very short focal length.
(C) The eyepiece is used as a simple magnifying glass.
(D) The objective and eyepiece are convex and concave lenses respectively.AP EAMCET 2011 Easy - Three uniform thin aluminium rods each of length \(2 \mathrm{~m}\) form an equilateral triangle \(P Q R\) as shown in the figure. The mid point of the \(\operatorname{rod} P Q\) is at the origin of the coordinate system. If the temperature of the system of rods increases by \(50^{\circ} \mathrm{C}\), the increase in \(y\)-coordinate of the centre of mass of the system of the rods is ............ \(\mathrm{mm}\). (Coefficient of volume expansion of aluminium \(=12 \sqrt{3} \times 10^{-6} \mathrm{~K}^{-1}\) )
AP EAMCET 2017 Hard - Two long straight parallel conductors \(10 \mathrm{~cm}\) apart, carry equal currents of magnitude \(3 \mathrm{~A}\) in the same direction. Then, the magnetic induction at a point midway between them isAP EAMCET 2015 Easy
- If the far point of a short sighted person is 400 cm, then the power of the lens required to enable him to see very distant objects clearly isAP EAMCET 2025 Easy
More PYQs from AP EAMCET
- For , if the equation and have a common root, then the value ofAP EAMCET 2021 Easy
- If the coefficient of \((2 r+1)\) th term and \((r+2)\) th term in the expansion of \((1+x)^{43}\) are equal, then \(r\) is equal to :AP EAMCET 2003 Easy
- Equation of the circle having its centre on the line \(2 x+y\) \(+3=0\) and having the lines \(3 x+4 y-18=0,3 x+4 y+2=\) 0 as tangents isAP EAMCET 2024 Medium
- The distance between the tangents of the hyperbola \(2 x^2-3 y^2=6\) which are perpendicular to the line \(x-2 y+5=0\) isAP EAMCET 2025 Medium
- A uniform conductor of resistance \(R\) is cut into 20 equal pieces. Half of them are joined in series and the remaining half of them are connected in parallel. If the two combinations are joined in series, the effective resistance of all the pieces isAP EAMCET 2002 Easy
- The correct order of increasing stabilities of the following carbocations is
(i) allyl carbocation
(ii) ethyl carbocation
(iii) benzyl carbocation
(iv) isobutyl carbocationAP EAMCET 2021 Easy