Question

1)describe an experiment to verify lami's theorem
and
2) Explain three modes of heat transmission.

plz anssss fast

Answer 1

1) Experimental Verification of Triangle Law and Lami’s Theorem:

Two smooth small pulleys are fixed, one each at the top corners of a drawing board kept vertically on a wall as shown in Figure. The pulleys should move freely without any friction. A light string is made to pass over both the pulleys. Two slotted weights P and Q (of the order of 50 g) are taken and are tied to the two free ends of the string. Another short string is tied to the centre of the first string at O. A third slotted weight R is attached to the free end of the short string. The weights P, Q and R are adjusted such that the system is at rest.

2) Heat transfer is the exchange of thermal energy between physical systems. The rate of heat transfer is dependent on the temperatures of the systems and the properties of the intervening medium through which the heatis transferred. The threefundamental modes of heat transfer are conduction, convection and radiation.