How much energy is needed to heat 100g of paraffin from 100C to 300C? The specific heat capacity of paraffin is 2200unit.
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slowly, but surely, two indian rockets were bom at thumba. they were christened rohini and menaka, after the two mythological dancers in the court of indra, the king of the sky. the indian payloads no longer needed to be launched by french rockets. could this have been done but for the atmosphere of trust and commitment which prof. sarabhai had created ? he made every man feel directly involved in problem solving. by the very fact of the team members’ participation, the solutions became genuine and earned the trust of the entire team resulting in total commitment towards implementation. prof. sarabhai was matter-of-fact. he used to talk with us in an honest and objective manner. sometimes i found him making tilings look more positive than they actually were, and then charming us by his almost magical powers of persuasion. when we were at the drawing board, he would bring someone from the developed world for a technical collaboration. that was his subtle way of challenging each one of us to stretch our capabilities. at the same time, even if we failed to meet certain objectives, he would praise whatever we had accomplished. whenever he found any one of us attempting a task for which he did not have the capability or skill, prof. sarabhai would re-assign activity in such a way so as to lower pressure and permit better quality work to be performed. by the time the first rohini-75 rocket was launched from terl on 20 november 1967, almost each one of us was in his own groove. early next year, prof. sarabhai called me urgently in delhi. by now i was accustomed to prof. sarabhai’s working methods. he was always full of enthusiasm and optimism. in such a state of mind, sudden flashes of inspiration were almost natural. on reaching delhi, i contacted prof. sarabhai’s secretary and was asked to meet him at 3.30 a.m. at hotel ashoka. delhi being a slightly unfamiliar place, with an unfriendly climate for someone like me, conditioned to the warm and humid climate of south india, i decided to wait in the hotel lounge.i have always been a religious person and i maintain a working partnership with god. i was aware that the best work required more ability than i possessed and therefore i needed help only god could give me. i made a true estimate of my ability raised it by 50 percent and put myself in god’s hands.
question:-
que.1- what was the speciality of prof. sarabhai's work?
que2 what were the ways that prove sarabai adopted for subtl challenges
que3 how was the author influenced by prof Sarabhai
que4 write the character sketch prof Sarah bhai
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11th
Physics
Thermodynamics
First Law of Thermodynamics
2000 J of energy is needed ...
PHYSICS
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Asked on December 26, 2019 by
Ekram Chakrapani
2000 J of energy is needed to heat 1 kg of paraffin through 1
o
C . How much energy is needed to heat 10 kg of paraffin through 2
o
C ?
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ANSWER
The heat energy required to raise the temperature of unit mass of substance through unit degree is called specific heat of substance . As given 2000J energy is needed to heat 1 kg of paraffin through 1
o
C, therefore specific heat of paraffin will be 2000J/kg−
o
C.
Now, heat energy required to raise the temperature of mass m of substance (specific heat c) through Δt is given by ,
Q=mcΔt,
Given: m=10kg,Δt=2
o
C,c=2000J/kg−
o
C
Q=10×2000×2=40,000J