Q16 of 27 Page 80

Calculate the temperature which has same numeral value on Celsius and Fahrenheit scale.

The relation between Celsius and Fahrenheit is as follows:


Here, temperature on Celsius is same as Fahrenheit. This means


Here, x is any variable.





So, at -40°C we have the same temperature in Fahrenheit scale i.e. -40°F.


More from this chapter

All 27 →
14

A student records the initial length l, change in temperature ∆T and change in length ∆l of a rod as follows:


If the first observation is correct, what can you say about observations 2, 3 and 4.


 15

Why does a metal bar appear hotter than a wooden bar at the same temperature? Equivalently it also appears cooler than wooden bar if they are both colder than room temperature.

 17

These days people use steel utensils with copper bottom. This is supposed to be good for uniform heating of food. Explain this effect using the fact that copper is the better conductor.

 18

Find out the increase in moment of inertia I of a uniform rod (coefficient of linear expansion α) about its perpendicular bisector when its temperature is slightly increased by ∆T.