Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
Concepts Of Physics MCQ Edition [Volume 1]PhysicsNewton's Laws of Motion

In a simple Atwood machine, two unequal masses m₁ and m₂ are connected by a string going over a clamped light smooth pulley. In an arrangement where m₁ = 300 g and m₂ = 600 g , the system is released from rest. Calculate the tension in the string.

Options

  1. A5.9 N
  2. B3.9 N
  3. C2.9 N
  4. D7.8 N

Correct answer

B. 3.9 N

Step-by-step solution

Given, m₁ = 300 g = 0.3 kg and m₂ = 600 g = 0.6 kg . Let T be the tension in the string and a be the acceleration of the masses. The equations of motion for the two masses are: m₂ g - T = m₂ a T - m₁ g = m₁ a Solving these equations for tension T , we get: T = 2 m₁ m₂ m₁ + m₂ g Substituting the given values and g = 9.8 m/s ^2 : T = 2 0.3 0.6 0.3 + 0.6 9.8 T = 0.36 0.9 9.8 T = 0.4 9.8 = 3.92 N Rounding to one decimal place, the tension is approximately 3.9 N .

Practice Newton's Laws of Motion on Quantrex Academy →

More from Newton's Laws of Motion

A block with a mass of 2 kg rests on a long frictionless horizontal table and is pulled horizontally by a constant force F . The block is observed to travel 10 m during the first tA block of mass 0.2 kg is suspended from the ceiling by a light string. A second block of mass 0.3 kg is suspended from the first block through another string. Determine the tensioPlaced on a smooth horizontal table, two blocks of equal mass m are connected by a light string. A constant force F is applied to pull one of the blocks along the line connecting tIn a TV picture tube, electrons are emitted from the cathode with negligible speed and attain a velocity of 5 10⁶ m/s after travelling one centimeter. Assuming straight line motionTravelling at 40 km/h , a car must be brought to a halt by applying brakes within the next 4.0 m . Given that the car weighs 2000 kg , determine the average force that must be applA particle of mass 50 g travels along a straight line. The variation of its speed with time is displayed in the figure. Determine the force acting on the particle at t = 2 , 4 , anTwo blocks A and B having masses m_A and m_B respectively are placed in contact on a frictionless table. An experimenter pushes block A from behind, causing the blocks to acceleratRaindrops, each having a radius of 1 mm and a mass of 4 mg , are falling at a speed of 30 m/s onto the head of a bald person. Upon splashing on the head, the drops come to rest. As Full Newton's Laws of Motion list All Concepts Of Physics MCQ Edition [Volume 1] PYQs