# Posts by Krishna

Total # Posts: 34

**Maths Mensuration**

Prove that the area of circular path of uniform width h surrounding a circular region at radius r is pi h 2r+h

**maths**

A worm climbs a rod by 5cms in one second and falls by 2cm next second. How many seconds it will take to climb 60cms rod?

**mathematics**

the 10th term of an arithmetic sequence is equal to the sum of 40 and 5th term.If the 15th term is 127 what is its common difference?what is its first term?what is the sum of the first 30 terms.

**math**

Of the three angles of a triangle one is twice the smallest and another one is thrice the smallest. Find the angles

**Science**

A sphere of mass 30.0 kg and radius 0.150 m is attached to a point on a smooth vertical wall by a string of length 0.150 m which runs from a point on the surface of the sphere to the point on the wall. Find the tension in the string and the horizontal force applied to the ...

**maths**

I don't know

**chemistry**

3 Cu2S + 8 SO4{-}2 + 8 H{+} = 6 CuO + 11 SO2 + 4 H2O

**Chemistry**

Molecules A and B react to produce molecule AB. If 60 mLs of 0.025 M A is added to 18 mLs of 0.175 M B, then how many moles of unreacted A or B will be left over? How many moles of AB will be produced?

**math**

a pulley is used to lift a mass with a force of 900N to a height of 10 metres in 2 minutes.find the work done by the force and also the power

**english**

what is a nouns

**government**

I was going to post it anyway

**maths**

the distance between two stations is 340 km two trains start simultaneously on parallel tracks to each other . the speed of one of them is greater than that of the other by 5 km/hr. if the distance between the two trains after 2 hrs of their start is 30 km , find the speed of ...

**Exponential**

Consider a = (x^2 -17x +71) and b = (x^2 -34x +240). case 1: let a = 1, b may be anything. x^2 -17x +71 = 1, which gives x = 7 or 10. case 2: let b =0 and a non-zero. x^2 -34x +240 = 0, gives x = 10 or 24. case 3 : let a = -1 and b = even. x^2 -17x +71 = -1, gives x = 9 or 8. ...

**physic**

a sportcar moving from rest 0 to 100km/h ..there hanging a pendulum in the car..what will be the angle pendulum can make with vertical line??

**Algebra**

the ans is 0

**Maths**

2m

**chemistry**

for depolarization of 1 mole of KMnO4, the moles of H2O2 required is_________

**College Physics**

A body of mass m breaks up into 2 parts of rest mass m1 and m2 with velocity v1 and v2 ,what will be the energies of m1 and m2 in terms of m,m1,m2 and c,the velocity of light.

**Physics**

A body of mass m breaks up into 2 parts of rest mass m1 and m2 with velocity v1 and v2 ,what will be the energies of m1 and m2 in terms of m,m1,m2 and c,the velocity of light.

**chemistry**

2.35*10^-4M,,Mg(OH)2 what is the pH of this solution

**Chemistry**

SIR PLEASE EXPLAIN THE ANSWER

**calculus--please helpp**

thanks so much!

**calculus--please helpp**

if the line 3x-4y=0 is tangent in the first quadrant to the curve y=x^3+k, find k. all i know is that its related to finding a derivative and i m basically completely lost....can please someone provide me some help?????

**Physics**

What is boyle's law?

**maths**

I think almost everyone forgetting the first line of the problem." A VAMPIRES A TOWN AND BITES TWO PERSONS EVERY NIGHT ". 1st night= 2 (bitten by original vampire) 2nd night= 2 +4(bitten by 2 persons turned vampires previous night) 3rd night= 2 +4(bitten by 2 ...

**puzzle**

Who to join 9 points place in a form of square in only 4 moves witg the help of two points place in outer square

**Chemistry**

C6H6 + (CH3)3Cl -AlCl3---> C6H5(CH3)3 C6H5(CH3)3 ---- HNO3/H2SO4--> para-NO2 C6H5(CH3)3---- major ortho-NO2 C6H5(CH3)3---- minor

**Chemistry**

Quinine has a tertiary amine group so acts as base QN + H2O -----> QNH+ + OH- given pka is 8.52 -log ka=8.52 ka= 3*10^-09, for conjugate acid base pair at 25degrees Celsius kw= ka*kb therefore Kb= kw/ka = 10^-14/ 3*10^-09 = 3.4 *10^-06 from equation kb=[QNH+][OH-]/[QN] QN...

**algrebra 2**

x=(-6,0) y=(0,18)

**Physics**

C=qy

**Physics**

Assume that a deposit of oil is located 2000 m directly below. Estimate the size of the deposit, assumed spherical.

**college**

i have free speech.my topic is have ever done anything that you wish you hadn't done?what happened and how the situation might have been different if you had acted or thought differently. really i don't know,how can i speak because i don't know about this.can you ...

**chem**

the answer is not clear

**university of the south Pacific**

Is sodium chloride an Ionic bonding or covalent bonding?

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