AP EAMCET · PHYSICS · Work Power Energy
The bob of a simple pendulum of length 200 cm is released from horizontal position. If \(10 \%\) of its initial energy is lost due to air resistance, then the speed of bob at the mean position is
(Acceleration due to gravity \(=10 \mathrm{~m} \mathrm{~s}^{-2}\) )
- A \(6 \mathrm{~m} \mathrm{~s}^{-1}\)
- B \(3 \mathrm{~m} \mathrm{~s}^{-1}\)
- C \(12 \mathrm{~m} \mathrm{~s}^{-1}\)
- D \(2 \mathrm{~m} \mathrm{~s}^{-1}\)
Answer & Solution
Correct Answer
(A) \(6 \mathrm{~m} \mathrm{~s}^{-1}\)
Step-by-step Solution
Detailed explanation
\(PE_{initial} = mgL\) \(KE_{final} = PE_{initial} - 0.10 PE_{initial} = 0.90 mgL\) \(\frac{1}{2}mv^2 = 0.90 mgL\) \(v = \sqrt{1.8 gL}\) \(v = \sqrt{1.8 \times 10 \times 2} = \sqrt{36}\) \(v = 6 \mathrm{~m} \mathrm{~s}^{-1}\)
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 geostationary satellite is taken to a new orbit such that its distance from centre of the earth is doubled. Then find the time period of this satellite in the new orbit.AP EAMCET 2021 Medium
- Three point charges shown in the figure lie along a straight line. The energy required to exchange the position of central charge with one of the negative charges is
AP EAMCET 2025 Medium - A body travelling along a straight line path travels first half of the distance with a velocity \(7 \mathrm{~ms}^{-1}\). During the travel time of the second half of the distance, first half time is travelled with a velocity \(14 \mathrm{~ms}^{-1}\) and the
second half time is travelled with a velocity \(21 \mathrm{~ms}^{-1}\). Then the average velocity of the body during the journey isAP EAMCET 2019 Medium - Two rectangular blocks of masses and are connected by a string and kept on a frictionless horizontal table. If a force of is applied on block away from block, then the tension in string isAP EAMCET 2022 Easy
- The magnetic field at the centre \(\mathrm{C}\) of the arrangement shown in figure is
AP EAMCET 2019 Easy - When the absolute temperature of the source of a Carnot heat engine is increased by \(25 \%\), its efficiency increases by \(80 \%\). The new efficiency of the engine isAP EAMCET 2016 Easy
More PYQs from AP EAMCET
- One mole of a gas expands such that its volume ' \(V\) ' changes with absolute temperature ' \(T\) ' in accordance with the relation \(V=K T^2\) where ' \(K\) ' is a constant. If the temperature of the gas changes by \(60^{\circ} \mathrm{C}\), then work done by the gas is ( \(R\) is universal gas constant).AP EAMCET 2017 Easy
- The balancing length for a cell is \(560 \mathrm{~cm}\) in a potentiometer experiment. When an external resistance of \(10 \Omega\) is connected in parallel to the cell, the balancing length changes by \(60 \mathrm{~cm}\). The internal resistance of the cell in ohms, isAP EAMCET 2002 Medium
- Two radioactive materials \(X_1\) and \(X_2\) have decay constants \(10 \lambda\) and \(\lambda\) respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of \(X_1\) to that of \(X_2\) will be \(1 / e\) after a timeAP EAMCET 2009 Easy
- The shortest distance between the skew lines \(\vec{r}(-\hat{i}-2 \hat{j}-3 \hat{k})+t(3 \hat{i}-2 \hat{j}-2 \hat{k})\) and \(\vec{r}=(7 \hat{i}+4 \hat{k})+s(\hat{i}-2 \hat{j}+2 \hat{k})\) isAP EAMCET 2024 Easy
- The number of water molecules present in borax, kernite and bauxite respectively areAP EAMCET 2023 Easy
- If \(C_j\) stands for \({ }^n C_j\), then
\[
\frac{\mathrm{C}_1}{\mathrm{C}_0}+\frac{2 \times \mathrm{C}_2}{\mathrm{C}_1}+\frac{3 \times \mathrm{C}_3}{\mathrm{C}_2}+\ldots+\frac{\mathrm{n} \times \mathrm{C}_{\mathrm{n}}}{\mathrm{C}_{\mathrm{n}-1}}=
\]AP EAMCET 2023 Hard