AP EAMCET · PHYSICS · Work Power Energy
A force of \(10 \mathrm{~N}\) acting at an angle on a particle produces a displacement of \((3 \hat{i}-4 \hat{\jmath}) \mathrm{m}\). Due to this force, if the kinetic energy of the particle is decreased by 25 joule, then the angle between the force and the displacement is
- A \(\cos ^{-1}\left(\frac{1}{3}\right)\)
- B \(30^{\circ}\)
- C \(120^{\circ}\)
- D \(\cos ^{-1}\left(\frac{3}{4}\right)\)
Answer & Solution
Correct Answer
(C) \(120^{\circ}\)
Step-by-step Solution
Detailed explanation
\begin{aligned} & \text { Work done }=\overrightarrow{\mathrm{F}} \cdot \overrightarrow{\mathrm{r}} \\ & \Rightarrow-25=\text { Fr } \cos \theta \quad[\because \text { Work done }=\Delta \mathrm{K}] \\ & \Rightarrow-25=10 \times 5 \times \cos \theta \\ & \Rightarrow \cos…
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 force of \((2.6 \hat{\mathbf{i}}+1.6 \hat{\mathbf{j}}) \mathrm{N}\) acts on a body of mass \(2 \mathrm{~kg}\). If the velocity of the body at time, \(t=0\) is \((3.6 \hat{\mathbf{i}}-4.8 \hat{\mathbf{j}}) \mathrm{ms}^{-1}\), the time at which the body will just have a velocity along \(x\)-axis only isAP EAMCET 2019 Easy
- An electric motor exerts a force of \(50 \mathrm{~N}\) on a a cable and pulls it through \(60 \mathrm{~m}\) in \(1 \mathrm{~min}\). The power supplied by the motor isAP EAMCET 2020 Medium
- In the Young's double slit experiment, the resultant intensity at a point on the screen is \(75 \%\) of the maximum intensity of the bright fringe. Then the phase difference between the two interfering rays at that point isAP EAMCET 2011 Easy
- An air bubble of radius \(1 \mathrm{~cm}\) rises from the bottom portion through a liquid of density \(1.5 \mathrm{~g} / \mathrm{cc}\) at a constant speed of \(0.25 \mathrm{~cm} \mathrm{~s}^{-1}\). If the density of air is neglected, the coefficient of viscosity of the liquid is approximately, (In Pas) :AP EAMCET 2006 Medium
- The ratio of the slopes of isothermal and adiabatic curves isAP EAMCET 2020 Easy
- Two particles having position vectors \(\mathbf{r}_1=(3 \hat{\mathbf{i}}+5 \hat{\mathbf{j}})\) metres and \(\mathbf{r}_2=(-5 \hat{\mathbf{i}}-3 \hat{\mathbf{j}})\) metres are moving with velocities \(\mathbf{v}_1=(4 \hat{\mathbf{i}}+3 \hat{\mathbf{j}}) \mathrm{m} / \mathrm{s}\) and \(\mathbf{v}_2=(a \hat{\mathbf{i}}+7 \hat{\mathbf{j}}) \mathrm{m} / \mathrm{s}\). If they collide after \(2 \mathrm{~s}\), then the value of \(a\) is :AP EAMCET 2003 Medium
More PYQs from AP EAMCET
- If \(100 \mathrm{~L}\) of an ideal gas at a pressure of \(2 \mathrm{~atm}\) compressed isothermally and reversibly to a final volume of ' \(\mathrm{X}\) ' \(\mathrm{L}\) releases \(-460.6 \mathrm{~L} \mathrm{~atm}\) heat, the final volume ' \(\mathrm{X}\) ' (in \(\mathrm{L}\) ) isAP EAMCET 2023 Easy
- A test tube of mass 6 g and uniform area of cross section \(10 \mathrm{~cm}^2\) is floating in water vertically when 10 g of mercury is in the bottom. The tube is depressed by a small amount and then released. The time period of oscillation is \(\left(\right.\) Acceleration due to gravity \(=10 \mathrm{~ms}^{-2}\) )AP EAMCET 2024 Medium
- The atomic numbers of elements \(X, Y\) and \(Z\) are 19, 21 and 25 respectively. The number of electrons present in the \(M\)-shell of these elements follow the orderAP EAMCET 2005 Easy
- \(160 \mathrm{~g}\) of non-volatile solute ' \(A\) ' is dissolved in \(54 \mathrm{~mL}\) of water at \(373 \mathrm{~K}\). What is the vapour pressure of aqueous solution of \(A\). (Given, molecular weight of \(A=160 \mathrm{~g} \mathrm{~mol}^{-1}\) )AP EAMCET 2020 Medium
- Consider the following two statements
\(Statement I:\) Among \(\mathrm{Mg}, \mathrm{Al}, \mathrm{Mg}^{2+}, \mathrm{Al}^{3+}\) the one having smallest size is \(\mathrm{Al}^{3+}\)
\(Statement II:\) Eu is having exceptionally high atomic radii among lanthanide elements
The correct answer isAP EAMCET 2023 Easy - A rectangular loop is provided with sliding connector of length \(1 \mathrm{~m}\) and resistance \(2 \Omega\). It is placed in a uniform magnetic field of \(2 \mathrm{~T}\) perpendicular to the plane of the loop. The external force required to keep the connector moving with uniform velocity \(2 \mathrm{~ms}^{-1}\) isAP EAMCET 2017 Medium