3.20 b) Given the resistances of 1 Ω, 2 Ω, 3 Ω, how will be combine them to get an equivalent resistance of (iii) 6 Ω
attach them in series
1 unit= 1Kilo watt hour= 3600000 joule
In this chapter, you have completed:
In this chapter, firstly you read about the concepts of properties of solids, then moved to concepts of properties of liquid and finally, you read about the concepts of thermal properties of matter and heat transfer and its various modes. Apart from this, there are certain tips for you which will be helpful for you to develop a lot of interest in this chapter. There are some examples as well as practice questions in each concept. This chapter has 5 to 6 % weightage for physics in JEE main exam and 3% weightage in the NEET examination.
Make sure you practice more and more to achieve what you desire. Don’t forget to give a chapter-wise test after completion of the chapter. Revision is the most important part so, don’t forget to do it.
Keep it up!!
No, its not possible practically to convert whole mechanical energy or work to heat. Some heat will get lost because of friction or due to temperature difference between system and surrounding
Mechanical energy can be converted into heat. This important physical observation is known as the mechanical equivalent of heat. So, mechanical equivalent of heat states that motion(Work) and heat are mutually interchangeable and that in every case, a given amount of work would generate the same amount of heat, provided the work done is totally converted to heat energy.
it is because, only the top layer of the lake or river freezes. And as we know that the density of ice is lower than the water, so it comes at the top surface. As the thermal conductivity of ice is very less so the heat is not conducted by the lower water (in which fish is living). So it makes fish to survive even in icy water because heat does not flow from water to the atmosphere and the water remains warm