On a frictionless surface, a block of mass M moving at speed v collides elastically with another block of same mass M which is initially at rest. After collision the first block moves at an angle θ to its initial direction and has a speed v3.

Let three numbers in G.P. be a, ar, ar2Since the sum of the numbers is 21∴          a + ar + ar2 = 21...(i)Since the sum of the squares of the numbers is 189∴ ...(ii)Squaring both sides of (i), we get ...(iii)Dividing (iii) by (ii), we get              When r = 2, from (i), a = 3∴     Numbers are 3, 3(2), 3(2)2  or 3, 6, 12When     from (i),  a = 12∴ Numbers are 12,    or 12, 6, 3

Try it yourself with the help of your class-teacher and classmates. Read the play out in parts. Enact the play on a suitable occasion. Answer: The play's title Mother's Day indicates that a suitable occasion for it to be performed may be the 2nd Sunday in May, when Mother's Day is most commonly celebrated.

Answer:The cell is2Fe3+ (aq) + 2I–(aq) →  2Fe2+(aq)+I2(s)E0 cell = 0.236 V0a∆r G0 =-nFE0cell            =-2×0.236×96487 C mol-1            = -45541 J            = -45.54 kJ mol-1
log Kc = nFE0cell2.303 × RT            = 2×96487×0.2362.303×8.31×298             = 45541.8645703.1031 = 7.9854or      Kc = Antilog 7.9854 or    Kc = 9.62 × 107

Cv = 5/2 RThe charge in internal energy of gas in  the transition from A to B  is...One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure, ...
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Top answer:
Δ U = nCvdT whene n is no. of moles, Cv is heat capacity at constant volume and dT is temperature change for diatomic gas Cv = 32R from ideal gas equation ...

Given, pH of Ba(OH)2 = 12pOH = 14-pH= 14-12 = 2We know that,pOH = -log [OH-]2 =-log [OH-][OH-] = antilog (-2)[OH-] = 1 x 10-2Ba(OH)2dissolves in water as 

Jack is really caught in an ugly middle position because he is divided into two different difficult situations. He is unable to run away from the harsh realities of life rather he has to acclimatise himself in accordance with the prevailing conditions. He has to manage his family consisting of two children, a daughter Jo and her brother Bobby. Thus, Jack is entangled in two worlds. The first world belongs to Roger Fish, Roger Squirrel or Roger Chipmunk. He is telling the story of a wise owl and the Wizard with a magic wand.
The world upstairs consists of his children, Jo and Jack. Jo has rai

For engine A:  For engine B:            Since         
∴            Also,      Here,   The first one A receives heat at 800 K and rejects to a reservoir at temperature T. The second engine B receives the heat rejected by the first engine and in turn rejects to a heat reservoir at 300 K.         

The combining capacity of an element is called its valency. The number of electrons present in the outermost shell of an atom gives its valency. But, if the number of valence electrons of the atom of an element is less than or equal to four, then the valency of that element is equal to the number of valence electrons. For example, the atom of silicon has four valence electrons. Thus, the valency of silicon is four.  On the other hand, if the number of valence electrons of the atom of an element is greater than four, then the valency of that element is obtained by subtracting the number of val

Doppler effect in light (speed of observer is not very small compared to speed of light)

तारे  वायुमंडलीय अपवर्तन के कारण टिमटिमाते है। पृथ्वी के वायुमंडल में प्रवेश करने के पश्चात पृथ्वी के पृष्ठ पर पहुंचने तक तारे का प्रकाश निरंतर अपवर्तित होता जाता है। वायुमंडलीय अपवर्तन उसी माध्यम  मैं होता है जिसका क्रमिक परवर्ती अपवर्तनांक हो क्योंकि वायुमंडल तारे के प्रकाश को अभिलंब की ओर झुका देता है,  अतः तारे की आभासी स्थिति  उसकी वास्तविक स्थिति से कुछ भिन्न होती है। 

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