Learning Materials
Features
Discover
Chapter 3: Problem 3
Fill in the Blanks. \(\frac{1}{1000}\) 1000 millisecond \(=1 \mathrm{~s}\) \(\Rightarrow 1\) millisecond \(=\frac{1}{1000}\) th part of a second.
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
\(\mathrm{A} \rightarrow \mathrm{f} \quad\) Spinning top rotates about its own axis. \(\mathrm{B} \rightarrow \mathrm{g} \quad\) Coin moves in a straight path over a carrom board. \(\mathrm{C} \rightarrow \mathrm{a} \quad\) A vehicle moving on a fly-over bridge undergoes curvilinear motion. \(\mathrm{D} \rightarrow \mathrm{e} \quad\) We know, a \(=\frac{\mathrm{v}-\mathrm{u}}{\mathrm{t}} \Rightarrow \mathrm{t}=\frac{\mathrm{v}-\mathrm{u}}{\mathrm{a}}\) \(\mathrm{E} \rightarrow \mathrm{c} \quad\) Distance-time graph of a body moving with constant speed is a straight line. \(\mathrm{F} \rightarrow \mathrm{b} \quad\) One oscillation means one to-and-for motion of a body. \(\mathrm{G} \rightarrow \mathrm{d} \quad\) The length of a seconds pendulum is \(100 \mathrm{~cm}\) (or) \(1 \mathrm{~m} .\)
A simple pendulum that has time period of \(2 \mathrm{~s}\) is called seconds pendulum. Its length is approximately \(100 \mathrm{~cm}\) or \(1 \mathrm{~m} .\)
The average distance per unit time, when the body is moving with variable speed, is called average speed, Average speed \(=\frac{\text { Total distance travelled }}{\text { Total time taken }}\)
Take a metre scale and measure the length of the string from the point of suspension to the lower tip of the bob \(\left(\ell_{1}\right)\) (b). Now, place the bob over a meter scale and hold it in position with two wooden blocks or stiff cardboards and measure the diameter (D) of the bob (c). Calculate the radius \(\mathrm{R}\) of the bob by dividing diameter by 2 (a). Then the length of the pendulum \(\ell=\left(\ell_{1}-\mathrm{R}\right)(\mathrm{d})\). Consider the formula \(\mathrm{T}\) \(=2 \pi \sqrt{\frac{\ell}{\mathrm{g}}}\) and find the time period of the simple pendulum by substituting the value of \({ }^{\prime} \ell^{\prime}(\mathrm{e})\).
(a) Uniform Velocity: When a body moves with uniform speed in a specified direction, it is said to be moving with uniform velocity. Thus, a body moves with uniform velocity when its magnitude as well as its direction remains the same. Example: Aeroplane moving with \(500 \mathrm{~km} \mathrm{~h}^{-1}\) towards east. (b) Variable velocity: When a body moves such that either its magnitude or direction or both change, then it is said to be moving with variable velocity. Example: A car moving on a straight road such that its speed changes from time to time has variable velocity. A car taking turn has variable velocity as its direction changes.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Exams 
GCSE 
IGCSE 
AS 
A Level 
International A Level 
University Admissions Tests 
Flashcards 
Vaia AI 
Notes 
Study Plans 
Study Sets 
Find a job 
Find a degree 
Student Deals 
Magazine 
Mobile App