Heat. Answer the question . 1. Give reason for following - a. Iron rims are heated red hot before fixing them on cart wheel. b. A clinical thermometer has a slight bend or kink in its capillary tube . c. A brass tumbler feels much cooler then a wooden tray on a chilly day. e. The bottoms of cooking utensil are often kept black. 2. Akshit visited Rishikesh for river during summer holidays. At a camsite there were two tends one made with black fabric and the other with white fabric . Which one should Akshit prefer? Give reason for the choice. Should Akshit prefer the same tend during winter? 3. Explain briefly how winds are caused? answer in two or three sentences?
Answers
Answer: Here is the answer:
Explanation:
1a. Iron rims are heated before they are fixed on a cart wheel because the iron rims are slightly smaller than the cart wheel so the iron rim is heated to expand the iron rim to fit on the cart wheel.
1b. The kink prevents the mercury present in the capillary to fall back into the bulb. So it separates the high temperature mercury and cool mercury and allows the user to take a reading when the thermometer is taken out.
1c. Brass tumbler FEELS colder than wooden tray if they're both at cold temperature because metal conducts heat much better than wood does. Since your hand is hotter than cold temperature, both the metal and the wood conduct heat away from it.
2. Akshit should choose the white fabric during the summer because black colored fabrics absorb heat while white fabrics reflect heat.
3. Wind is caused by differences in the atmospheric pressure. When a difference in atmospheric pressure exists, air moves from the higher to the lower pressure area, resulting in winds of various speeds.
I hope this helps.
GOOD LUCK!