Learn

Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 24 February 2021, Shift 2, Physics Q4

Question 4 of 90 in this shift, Physics question 4 of 30, Section A.

A body weighs 49 N on a spring balance at the north pole. What will be its weight recorded on the same weighing machine, if it is shifted to the equator ? [Use g=GMR2=9.8 ms−2g = \frac{GM}{R^2} = 9.8\ \mathrm{ms^{-2}} and radius of earth, R = 6400 km.]
  1. (1)49.17 N49.17\ \mathrm{N}
  2. (2)49 N49\ \mathrm{N}
  3. (3)48.83 N48.83\ \mathrm{N}Official answer
  4. (4)49.83 N49.83\ \mathrm{N}

Official answer

Option 3

NTA final key.

Chapter
Gravitation
Topic
Circular Motion
Idea tested
Centrifugal Pseudo-Force

Same idea in other shifts

Asked 3× in all
  1. 8 Apr 2024, Shift 2 · Q52A circular table is rotating with an angular velocity of ω\omega rad/s about its axis (see figure). There is a smooth groove along a…HardNumerical valueHas a figure
  2. 6 Apr 2023, Shift 2 · Q34A child of mass 5 kg is going round a merry-go-round that makes 1 rotation in 3.14 s. The radius of the merry-go-round is 2 m. The…EasySingle 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 108 of the 174 JEE Main shifts held from 2017 to 2026.