
Calculate the angular speed and linear speed of the tip of a second hand of the clock if the second hand is 5cm long.
Answer
484.2k+ views
2 likes
Hint: Let us consider the clock as a circular path and take the length of the second hand of the clock as the radius of the circular path. Angular speed is calculated as angular displacement per unit time and linear speed is calculated as total distance travelled per unit time.
Formula Used:
.
Complete step by step answer:
Angular Speed is the rate at which an object changes its angle in radians, in a given period of time.
In complete revolution, Second hand of the clock covers an angular displacement of or radian in 60 seconds.
So, we have: Angular Displacement = radian and time (t) = 60 seconds……….. (i)
Thus,
Now, we put the value of angular displacement and time from (i) in above equation, we have:
Putting the value of , we have:
Linear speed is defined as the rate of change of distance covered in unit time.
The relation between linear speed and angular speed is:
……………… (ii)
Here, Radius is the length of a second hand.
Given, length of second hand = 5 cm
So, Radius (r) = 5 cm
As, we know that 1 cm=0.01 m, so we convert the unit of radius in metre, then we have:
From above, the value of angular speed is 0.1046 rad/sec.
Now, we put the value of radius and angular speed in equation (ii),then we have:
Thus, we have calculated the value of Angular Speed = 0.1046 rad/sec and
Linear speed = 0.00523m/sec.
Note: SI unit of angular speed is rad/sec. But, in many physical applications, angular speed is given as revolution per min, abbreviated as rpm. To convert angular speed from rpm to rad/sec, we have the following formula:
Formula Used:
Complete step by step answer:
Angular Speed is the rate at which an object changes its angle in radians, in a given period of time.
In complete revolution, Second hand of the clock covers an angular displacement of
So, we have: Angular Displacement
Thus,
Now, we put the value of angular displacement and time from (i) in above equation, we have:
Putting the value of
Linear speed is defined as the rate of change of distance covered in unit time.
The relation between linear speed and angular speed is:
Here, Radius is the length of a second hand.
Given, length of second hand = 5 cm
So, Radius (r) = 5 cm
As, we know that 1 cm=0.01 m, so we convert the unit of radius in metre, then we have:
From above, the value of angular speed is 0.1046 rad/sec.
Now, we put the value of radius and angular speed in equation (ii),then we have:
Thus, we have calculated the value of Angular Speed = 0.1046 rad/sec and
Linear speed = 0.00523m/sec.
Note: SI unit of angular speed is rad/sec. But, in many physical applications, angular speed is given as revolution per min, abbreviated as rpm. To convert angular speed from rpm to rad/sec, we have the following formula:
Latest Vedantu courses for you
Grade 11 Science PCM | CBSE | SCHOOL | English
CBSE (2025-26)
School Full course for CBSE students
₹41,848 per year
Recently Updated Pages
Master Class 11 Economics: Engaging Questions & Answers for Success

Master Class 11 Accountancy: Engaging Questions & Answers for Success

Master Class 11 English: Engaging Questions & Answers for Success

Master Class 11 Social Science: Engaging Questions & Answers for Success

Master Class 11 Physics: Engaging Questions & Answers for Success

Master Class 11 Biology: Engaging Questions & Answers for Success

Trending doubts
Which one is a true fish A Jellyfish B Starfish C Dogfish class 11 biology CBSE

State and prove Bernoullis theorem class 11 physics CBSE

In which part of the body the blood is purified oxygenation class 11 biology CBSE

1 ton equals to A 100 kg B 1000 kg C 10 kg D 10000 class 11 physics CBSE

Find the value of the expression given below sin 30circ class 11 maths CBSE

Difference Between Prokaryotic Cells and Eukaryotic Cells
