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Friday, 9 October

JEE Main 2023 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 6 April 2023, Shift 1, Physics Q48

Question 48 of 90 in this shift, Physics question 18 of 30, Section A.

A small block of mass 100 g is tied to a spring of spring constant 7.5 N/m and length 20 cm. The other end of spring is fixed at a particular point A. If the block moves in a circular path on a smooth horizontal surface with constant angular velocity 5 rad/s about point A, then tension in the spring is -
  1. (1)0.25 N
  2. (2)0.50 N
  3. (3)0.75 NOfficial answer
  4. (4)1.5 N

Official answer

Option 3

NTA final key.

Chapter
Laws of Motion
Topic
Circular Motion
Idea tested
Spring-Mass in Circular Motion

Same idea in other shifts

Asked 3× in all
  1. 8 Jan 2020, Shift 1 · Q2A particle of mass m is fixed to one end of a light spring having force constant k and unstretched length ll. The other end is fixed. The…MediumSingle correct
  2. 9 Jan 2020, Shift 2 · Q6A spring mass system (mass mm, spring constant kk and natural length ll) rests in equilibrium on a horizontal disc. The free end of the…MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.