##### Get a free home demo of LearnNext

Available for CBSE, ICSE and State Board syllabus.
Call our LearnNext Expert on 1800 419 1234 (tollfree)
OR submit details below for a call back

clear
Finding exercises tough? Install LearnNext+ app to watch our videos and get a crystal clear understanding of concepts Install Now X
X

Install the app to watch our videos and get a crystal clear understanding of concepts

Install Now
searchtune

Pranesh Rao

Dec 24, 2014



Derivatio...

Mar 12, 2014



Milan

Feb 6, 2014



Abhishek

Feb 28, 2014



Rushin Naik

Feb 17, 2015

#### 1. What is work done by a coolie walking on level road with load on his head? 2. Why is work done zero when, the direction of displacement and the direction of force on a body are perpendicular to each other?



Work done on an object is energy spent to do work on object against a f...

Varunkumar Medi

Jan 2, 2014

#### what are three characteristics of sound waves ? On what factors do they depend .



Characteristics of sound waves:
Wavelength: Sound consists of a longitudinal wave that includes compressions and rarefactions as they travel through a...

Nipunn verma

Oct 14, 2013

#### Is Potential energy a vector quantity or scalar?



Potential energy is a scalar quantity. it has only magnitude but no direction. But in some cases we may consider  it as either positive or negative. This does not mean that it...

Trisha Sharma

Feb 18, 2016

#### wht is commercial unit of energy ? wht is its use??? relate with SI unit of energy



Ans:
The commercial unit of energy is kilowatt hour (kW-h)
The kilowatt-hour is not a standard unit in any formal system, but it is commonly used in el...

Garvita jain

Jan 5, 2015



Pranesh Rao

Dec 24, 2014



Derivatio...

Mar 12, 2014



Milan

Feb 6, 2014



Abhishek

Feb 28, 2014



Rushin Naik

Feb 17, 2015

#### 1. What is work done by a coolie walking on level road with load on his head? 2. Why is work done zero when, the direction of displacement and the direction of force on a body are perpendicular to each other?



Work done on an object is energy spent to do work on object against a f...

Varunkumar Medi

Jan 2, 2014

#### what are three characteristics of sound waves ? On what factors do they depend .



Characteristics of sound waves:
Wavelength: Sound consists of a longitudinal wave that includes compressions and rarefactions as they travel through a...

Nipunn verma

Oct 14, 2013

#### Is Potential energy a vector quantity or scalar?



Potential energy is a scalar quantity. it has only magnitude but no direction. But in some cases we may consider  it as either positive or negative. This does not mean that it...

Trisha Sharma

Feb 18, 2016

#### wht is commercial unit of energy ? wht is its use??? relate with SI unit of energy



Ans:
The commercial unit of energy is kilowatt hour (kW-h)
The kilowatt-hour is not a standard unit in any formal system, but it is commonly used in el...

Garvita jain

Jan 5, 2015