Question

Give reason for the following:-
1.Iron reams are heater before 'fixing' them on cart wheel.
2.A new quilt is warmer than an old one.
3.A brass tumbler feels much cooler than a wooden tray on a chilly day.
Who will give proper answer I will Mark him as brainliest​

Answer 1

1.Iron reams are heated before fixing them on cartwheel is because:

Metals expand on heating and contract on cooling. This expansion and contraction of a metal is a reversible change. The metallic rim used is slightly smaller in diameter than the wheels .On heating the rim expands. And can easily lie on the wheels. When the rim cools, it contract and press tightly on to the wheels.

2. A new quilt is warmer than the old one because:as old one shrinks and decreases air space but the new one has many air spaces so they are warmer than old ones

3. A brass tumbler feels much cooler than a wooden tray on a chilly day because: brass is a good conductor of heat. when one touches the brass tumbler,heat is conducted from the body to the brass tumbler easily.hence,the temperature of the body reduces to the lower value and one feels cooler

Wood is a poor conductor of heat.when one touches the wooden tray very little heat is conductedfrom the body to the wooden tray.hence, there is only a negligible drop is in temperature in the body and one doesn't feel cool

if u like my answer don't forget to mark as brainliest

Answer 2

Answer:

all answer described above are correct