NEET Exam  >  NEET Questions  >   A mass of 2kg is whirled in a horizontal cir... Start Learning for Free
A mass of 2kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, the tension in the string is doubled. The new speed is nearly
  • a)
    2.25 rpm
  • b)
    7 rpm
  • c)
    10 rpm
  • d)
    14 rpm
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A mass of 2kg is whirled in a horizontal circle by means of a string ...
Given:
Mass of the object (m) = 2 kg
Initial speed (v1) = 5 revolutions per minute (rpm)
Initial tension in the string (T1) = ?
New tension in the string (T2) = 2*T1 = ?
New speed (v2) = ?


Concept:
When an object moves in a circular path, it experiences a centripetal force that keeps it moving in a circle. This force is provided by the tension in the string.

The centripetal force (F) is given by the equation:
F = mv^2 / r
Where,
m = mass of the object
v = speed of the object
r = radius of the circular path

The tension in the string is equal to the centripetal force:
T = mv^2 / r


Calculation:

Step 1: Calculate the initial tension in the string (T1):
T1 = m*v1^2 / r
= 2*5^2 / r
= 50 / r

Step 2: Calculate the new tension in the string (T2):
T2 = 2*T1
= 2*(50 / r)
= 100 / r

Step 3: Calculate the new speed (v2):
T2 = m*v2^2 / r
100 / r = 2*2^2 / r
100 = 4
v2^2 = 100 / 4
v2 = √(100 / 4)
v2 = 5

Therefore, the new speed (v2) is 5 revolutions per minute (rpm).

Answer:
The new speed is approximately 5 rpm.
Free Test
Community Answer
A mass of 2kg is whirled in a horizontal circle by means of a string ...
T=m⍵2r
Attention NEET Students!
To make sure you are not studying endlessly, EduRev has designed NEET study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in NEET.
Explore Courses for NEET exam

Top Courses for NEET

A mass of 2kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, the tension in the string is doubled. The new speed is nearlya)2.25 rpmb)7 rpmc)10 rpmd)14 rpmCorrect answer is option 'B'. Can you explain this answer?
Question Description
A mass of 2kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, the tension in the string is doubled. The new speed is nearlya)2.25 rpmb)7 rpmc)10 rpmd)14 rpmCorrect answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A mass of 2kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, the tension in the string is doubled. The new speed is nearlya)2.25 rpmb)7 rpmc)10 rpmd)14 rpmCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A mass of 2kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, the tension in the string is doubled. The new speed is nearlya)2.25 rpmb)7 rpmc)10 rpmd)14 rpmCorrect answer is option 'B'. Can you explain this answer?.
Solutions for A mass of 2kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, the tension in the string is doubled. The new speed is nearlya)2.25 rpmb)7 rpmc)10 rpmd)14 rpmCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free.
Here you can find the meaning of A mass of 2kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, the tension in the string is doubled. The new speed is nearlya)2.25 rpmb)7 rpmc)10 rpmd)14 rpmCorrect answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of A mass of 2kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, the tension in the string is doubled. The new speed is nearlya)2.25 rpmb)7 rpmc)10 rpmd)14 rpmCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for A mass of 2kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, the tension in the string is doubled. The new speed is nearlya)2.25 rpmb)7 rpmc)10 rpmd)14 rpmCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of A mass of 2kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, the tension in the string is doubled. The new speed is nearlya)2.25 rpmb)7 rpmc)10 rpmd)14 rpmCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice A mass of 2kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, the tension in the string is doubled. The new speed is nearlya)2.25 rpmb)7 rpmc)10 rpmd)14 rpmCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice NEET tests.
Explore Courses for NEET exam

Top Courses for NEET

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev