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Hrishabh G.
Faculty Chemistry for IIT JEE students
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Basic Math
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Question:

A sum of $36.90 is made up of 180 coins which are either 10 cents or 25 cents coins or both. Determine the number of each type of coins

Hrishabh G.
Answer:

Let the number of 10 cents coins and 25 cents coins be X and Y respectively. Given that "X + Y = 180" .................(i) And 10X + 25Y = 3690 ..................(ii) Now, Multiply (i) by 10 10X + 10 Y = 1800 ..........................(iii) Subtract (iii) from (ii) 10X + 25Y - (10X + 10Y) = 3690 - 1800 15 Y = 1890 Y = 1890/15 Y = 126............(iv) Put (iv) in (i) X = 180 -126 = 54 X= 54 , Y = 126 (Ans.)

Chemistry
TutorMe
Question:

Comment on Thermodynamic Processes

Hrishabh G.
Answer:

1. ISOBARIC PROCESS - occurs at constant pressure 2. ISOCHORIC PROCESS - occurs at constant volume 3. ISOTHERMAL PROCESS - occurs at constant temperature 4. ADIABATIC PROCESS - occurs without any loss or gain of heat, i.e., Change in Q = 0 5. ISENTROPIC PROCESS (or REVERSIBLE ADIABATIC) - occurs at constant entropy 6. ISENTHALPIC PROCESS - occurs at constant enthalpy 7. STEADY STATE PROCESS - occurs without a change in the internal energy of the system

Environmental Engineering
TutorMe
Question:

What is Mitigation of Global Warming?

Hrishabh G.
Answer:

Global warming implies an increase in the average temperature of the Earth's atmosphere near the surface. Most of this observed increase in temperature has been caused by increasing concentrations of Green House Gases, which in itself is a result of human activities. Mitigation of Global Warming implies reducing the future warming of the climate. IPCC defines it as activities that reduce greenhouse gas emissions or enhance the capacity of carbon sinks to absorb greenhouse gases from the atmosphere.

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