Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Work Energy and Power question

2019 · Q138
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Work Energy and Power
  5. /2019 · Q138

Work Energy and Power question

2019 · Q138

NEETPhysicsWork Energy and PowerMCQ+4 / −1
A force F = 20 + 10y acts on a particle in y-direction where F is in newton and y in meter. Work done by this force to move the particle from y = 0 to y = 1 m is :
  1. A
    5 J
  2. B
    25 J
  3. C
    20 J
  4. D
    30 J
View written solutionFree

Correct answer: B

Work done under the given variable force is :

W = ∫y1y1Fdy\int\limits_{{y_1}}^{{y_1}} {Fdy} y1​∫y1​​Fdy

Here, y1 = 0, y2 = 1 m

∴\therefore∴ W = ∫01(20+10y)dy\int\limits_0^1 {\left( {20 + 10y} \right)dy} 0∫1​(20+10y)dy

= [20y+10y22]01\left[ {20y + {{10{y^2}} \over 2}} \right]_0^1[20y+210y2​]01​ = 25 J

PreviousNext

More from Work Energy and Power

  • A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure) just completes a vertical circle of diameter AB = D. The height h is equal to Includes diagram2018 · MCQ
  • Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m s−1. Take 'g' constant with a value 10 m s−2. The work done by the (i) gravitational force and the (ii) resistive…2017 · MCQ
  • A particle of mass 10 g moves along a circle of radius 6.4 cm with a constant tangential acceleration. What is the magnitude of this acceleration if the kinetic enegy of the particle becomes equal to 8 × 10−4 J by the end of the…2016 · MCQ
  • A body of mass 1 kg begins to move under the action of a time dependent force F=(2ti+3t2J)N, where i and j​ are unit vectors along x and y axis. What…2016 · MCQ
  • What is the minimum velocity with which a body of mass m must enter a vertical loop of radius R so that it can complete the loop?2016 · MCQ
  • A particle moves from a point (−2i+5j​) to (4j​+3k) when a force of (4i+3j​) N is applied. How much work has been done by…2016 · MCQ
  • Two particles A and B, move with constant velocities v1​​ and v2​​. At the initial moment their position vectors are r1​​ and r2​​…2015 · MCQ
  • A ball is thrown vertically downwards from a height of 20 m with an initial velocity v0. It collides with the ground, losses 50 percent of its energy in collision and rebounds to the same height. The initial velocity v0 is (Take g = 10 m s−…2015 · MCQ