AP EAMCET · PHYSICS · Gravitation
Assertion (A)
Angular speed, linear speed and kinetic energy change with time but angular momentum remains constant for a planet orbiting the sun.
Reason (R) Angular momentum is constant as no torque acts on the planet.
- A Both \(\mathrm{A}\) and \(\mathrm{R}\) are true and \(\mathrm{R}\) is a correct explanation for \(A\).
- B Both \(\mathrm{A}\) and \(\mathrm{R}\) are true but \(\mathrm{R}\) is not a correct explanation for \(A\).
- C \(A\) is true, \(R\) is false.
- D \(A\) is false, \(R\) is true.
Answer & Solution
Correct Answer
(A) Both \(\mathrm{A}\) and \(\mathrm{R}\) are true and \(\mathrm{R}\) is a correct explanation for \(A\).
Step-by-step Solution
Detailed explanation
As we know that, Torque is the moment of force and torque \((\tau)=\mathbf{r} \times \mathbf{F}\) where, \(\mathbf{r}\) is distance between axis of rotation and force \((F)\). Also, \(\tau=\frac{d L}{d t}\) and since, in space there is no external torque is applied so,…
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
- The energy dissipated per unit volume per cycle in the hysteresis of an iron sample of mass \(10 \mathrm{~kg}\) is \(200 \mathrm{Jm}^{-3} \mathrm{cycle}^{-1}\). The density of iron is \(7500 \mathrm{~kg} \mathrm{~m}^{-3}\). The loss of energy per hour at 50 cycle s \(^{-1}\) isAP EAMCET 2017 Hard
- A plane electromagnetic wave of frequency \(25 \mathrm{MHz}\) travels in free space along the X-direction. At a particular point in space and time the electric field is \(\vec{E}=6.3 \hat{\mathrm{j} ~ V m}{ }^{-1}\). Then the magnetic field at that point isAP EAMCET 2017 Easy
- A 3 kg block is connected as shown in the figure. Spring constants of two springs \(\mathrm{K}_1\) and \(\mathrm{K}_2\) are \(50 \mathrm{Nm}^{-1}\) and \(150 \mathrm{Nm}^{-1}\) respectively. The block is released from rest with the springs unstretched, The acceleration of the block in its lowest position is \(\left(\mathrm{g}=10 \mathrm{~ms}^{-2}\right)\)
AP EAMCET 2024 Medium - A uniform steel rod of mass \(1.8 \mathrm{~kg}\) and length \(0.8 \mathrm{~m}\) is hung from a nail with the help of a steel wire of area of cross-section \(0.01 \mathrm{~mm}^2\) and unstretched length of \(1 \mathrm{~m}\) as shown in the figure. The centre of mass of the rod lies vertically below the nail. The increase in the distance between the centre of mass of the rod and the nail due to stretching of the wire as the rod hungs is ____ \(\mathrm{mm}\).
(Young's modulus of steel \(=2 \times 10^{11} \mathrm{Nm}^{-2}\) and acceleration due to gravity \(=10 \mathrm{~ms}^{-2}\))
AP EAMCET 2017 Easy - A toroid of \(n\) turns, mean radius \(R\) and cross-sectional radius a carries current \(I\). It is placed on a horizontal table taken as \(x y\)-plane. Its magnetic moment \(m\)AP EAMCET 2021 Easy
- In a meter bridge experiment. a resistance of \(9 \Omega\) is connected in the left gap and an unknown resistance greater than \(9 \Omega\) is connected in the right gap. If the resistance in the gaps are interchanged, the balancing point shifts by 10 cm . The unknown resistance isAP EAMCET 2024 Hard
More PYQs from AP EAMCET
- The equation of the common tangent drawn to the curves \(y^2=8 x\) and \(x y=-1\) isAP EAMCET 2016 Medium
- An aromatic compound "A" on treatment with \(\mathrm{Zn} / \mathrm{NH}_4 \mathrm{Cl}\) and subsequent heating with ammonical silver nitrate solution gives a black precipitate. Which functional groups does "A" contain?AP EAMCET 2020 Easy
- The basis of quantum mechanical model of an atom isAP EAMCET 2013 Easy
- In a co-axial, straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zeroAP EAMCET 2021 Medium
- How many distinct alkenes obtained from the 3-Bromo3-methylhexane upon treatment with alc. \(\mathrm{KOH}\) ?AP EAMCET 2023 Medium
- If \(x\) is the number of ways in which six women and six men can be arranged to sit in a row such that no two women are together and if \(y\) is the number of ways they are seated around a table in the same manner, then \(x: y=\)AP EAMCET 2018 Medium