Explain why :
a brass tumbler feels much colder thn wooden tray on a chilly day.

Explain with reason why if ice melts at pole then moment of inertia of earth increases, angular velocity omega decreases and day night will be longer?

Explain why a test tube immersed at a certain angle in a tumbler of water appears to have a mirror suface for a certain viewing position? (AS_(7))

Spring fitted doors close by themselves when released. You want to keep the door open for a long time, say for an hour. If you put a half kg stone in front of the open door, it does not help. The sotne slides with the door and the door gets closed. However, if you sandwitch a 20 g of wood in the small gap between the door and the floor, the door stays open. Explain why a much lighter peice of wood is able to keep the door open while the heavy fails.

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 .

A person is sleeping during day time. Why does this happen with some people that they feel sleepy during day time in office or in the classroom. Have you ever come across such situation? Explain.

A. The electric field of a plane electromagnetic wave travelling in the +ve Z - direction is described by a. Ex=E_(0)sin (kz+omega t) b. Ex = E_(0)sin (kz - omega t) c. Ex = E_(0)sin (2kz) d. Ex=E_(0)sin (kz) B. We feel excessive sweating on a cloudy day. Why ?

If you are chilly outside the shower stall, why do you feel warm after the bath if you stay in the bathroom? (AS_7)