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

Laws of Motion question

2013 · Q146
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. /Laws of Motion
  5. /2013 · Q146

Laws of Motion question

2013 · Q146

NEETPhysicsLaws of MotionMCQ+4 / −1
Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upwards at constant speed v. What is the net force on the block of mass 2m ? (g is the acceleration due to gravity)
NEET 2013 Physics - Laws of Motion Question 22 English
  1. A
    3mg
  2. B
    6mg
  3. C
    zero
  4. D
    2mg
View written solutionFree

Correct answer: C

NEET 2013 Physics - Laws of Motion Question 22 English Explanation


From figure

F = 6 mg,

As speed is constant, acceleration a = 0

∴\therefore∴ 6 mg = 6ma = 0, F = 6 mg

∴\therefore∴ T = 5 mg , T' = 3 mg

T'' = 0 Fnet on block of mass 2 m

= T – T' – 2 mg = 0

ALTERNATE :
∵\because∵ v = constant so, a = 0, Hence, Fnet = ma = 0

PreviousNext

More from Laws of Motion

  • A stone is dropped from a height h. It hits the ground with a certain momentum P. If the same stone is dropped from a height 100% more than the previous height, the momentum when it hits the ground will change by2012 · MCQ
  • A conveyor belt is moving at a constant speed of 2 ms−1. A box is gently dropped on it. The coefficient of friction between them is μ = 0.5. The distance that the box will move relativce to belt before coming to rest on it, taking g…2011 · MCQ
  • A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s2. If g = 10 ms−2, the tension in the supporting cable is2011 · MCQ
  • A body of mass M hits normally a rigid wall with velocity V and bounces back with the same velocity. The impulse experienced by the body is2011 · MCQ
  • A block of mass m is in contact with the cart C as shown in the figure. The coefficient of static friction between the block and the cart is μ. The acceleration α of the cart that will prevent the block from falling satisfies Includes diagram2010 · MCQ
  • The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, then its acceleration is :2009 · MCQ
  • A body, under the action of a force F=6i−8j​+10k, acquires an accelerations of 1 m/s2. The mass of this body must be2009 · MCQ
  • A roller coaster is designed such that riders experience ''weightlessness'' as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of the hill is between2008 · MCQ