What are used in nuclear reactors to keep the chain reaction under control?

Given M and L are total length and mass of the chain. M = 4 kg L = 2 m And let length and mass of part of chain hanging down are l and m...

(a) Grazing food chain and detritus food chain Grazing food chain Detritus food chain In this food chain, energy is derived from the Sun. In this food chain, energy comes from organic matter (or...

A bimolecular reaction becomes rst order reaction when one of the reactants is in excess. 

Budgetary control is a technique of controlling that involves preparing plans in the form of budgets. Budget refers to a financial or a quantitative statement that defines the targets to...

Removal of lions from the above food chain will increase the number of deer to such an extent that they will eat up the whole grass. The density of producer...

(a) It is thermostable / remains active during the high temperature induced denaturation of (double stranded) DNA , (bacterium) Thermus acquaticus  (b) To obtain multiple copies of the gene (or DNA)...

Correct option (c) Explanation: The ceiling pulls the chain with a force equal to the sum of weights of chain and the body.  So the pulling force = (w1 + w2)