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NCERT Solutions for Class 11 Physics Physics Part I Chapter 4 Motion In A Plane

Motion In A Plane Here is the CBSE Physics Chapter 4 for Class 11 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 11 Physics Motion In A Plane Chapter 4 NCERT Solutions for Class 11 Physics Motion In A Plane Chapter 4 The following is a summary in Hindi and English for the academic year 2025-26. You can save these solutions to your computer or use the Class 11 Physics.

Question 1
CBSEENBI11019949
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A stone tied to the end of a string 80 cm long is whirled in a horizontal circle with a constant speed. If the stone makes 14 revolutions in 25 s, what is the magnitude and direction of acceleration of the stone. 
Solution

Given, 
Length of the string, l = 80 cm
Number of revolutions = 14
Time taken = 25 s
Frequency comma space straight nu space equals space fraction numerator No. space of space revolutions over denominator Time space taken end fraction space equals space 14 over 25 Angular space frequency comma space straight omega space equals space 2 πν space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 2 cross times 22 over 7 cross times 14 over 25 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 88 over 25 space rad divided by sec space Centripetal space acceleration comma space straight a subscript straight c space equals space straight omega squared straight r space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals open parentheses 88 over 25 close parentheses squared cross times 0.85 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 9.91 space straight m divided by straight s squared space

The direction of centripetal acceleration is always directed along the string, toward the centre, at all points.

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