saurav

This page lists questions and answers that were posted by visitors named saurav.

Questions

The following questions were asked by visitors named saurav.

A solid of relative density 1.25 is found to weigh 12 g in water.find its weight in air.

A sample of certain mass of a gas was collected and it was fond that the number of atoms and the number of molecules in the collected sample are equal.from this observation infer the type of molecules of gas.

10 years ago

A loboratory uses an ultrasonic-scanner to trance tumar in tissue. The operting frequency of the 6 scanner is 4.2*10 hz.calculate the wavelength of sound in the tissue if the speed of the sound is 1700 m/s.

10 years ago

In a water tank,on throwing a stone 20 full ripples are produced in 1 sec.the distance a crest and a through is 10 cm.calculate: (a) the wavelength of ripple (b) frequncy of ripple (c) velocity of the ripples.

10 years ago

With the help of a labeled diagram describe in brief the rutherford's alpha particle scattering experment. Write three important conclusions drawn frm the expirment.

10 years ago

Define buoyancy.state the factors on which buoyant force depends?

10 years ago

How can you test calcium nitride.. ( Ca3N2) I have written the reaction between calcium and nitrogen. A question that says " how will you test the product formed " is given. SO can you please help me, How can you test calcium nitride?

10 years ago

How to test calcium nitride.? ( ca3n2) when calcium reacts with nitrogen , Calcium nitride is formed. How can we test that the product formed is calcium nitride?

10 years ago

If the point (a,0) and (0,b) and (1,1) lie on the same line, prove that 1/a + 1/b=1

10 years ago

p and q are two points on the line x - y + 1 = 0 such that each of them is 5 units far from the origin. Find the co-ordinates of the points

10 years ago

A straight line passes through the point (-1,2) and its distance from the origin is 1 unit. Find the equation

10 years ago

When a mixture of two black powders is heated, it gave off a gas which turned lime water milky Give a chemical equation to show the reaction between gas and lime water Red scales residue can be seen on the black residue. Name the red scales The red scale...

10 years ago

25 % of a class of 40 students are girls. When some new girls joined the class, the percentage of girls increased to 40 %. How many new girls are joined the class

10 years ago

20 men can do a piece of work in 24 days. After working for 6 days, additional men are employed to finish the work in 21 days from the beginning. Find the number of additional men

10 years ago

show that : sin(A+B).sin(A-B)=Cos^2B - Cos^2A =sin^2A - sin^2B

10 years ago

Why are the trunks of fruit trees painted with a mixture of copper sulphate and calcium hydroxide

10 years ago

Answers

The following answers were posted by visitors named saurav.

its five... let the points be abc, put "a" anywhere. you can place b at diametrically opposite or not (1/2) then if they are not diametrical opposite then there are two sides where we can place c.and one gives acute and other gives obtuse... so 1/2 so 1/2...

11 years ago

I don't now

10 years ago

I don't konw plzz help

10 years ago

here, x1 = - 1 y1 = 3 x2= - 4 y2 = 2 Vector AB= ( x2 - x1 y2 - y1) =(-4 + 1 2 - 3) =(- 3, - 1 ) x. component = - 3 , y component = - 1 magnitude = root under (x comp)2 + (y comp)2 = root under 9 +1 = root 10 units Help me with chemistry please if you can...

10 years ago

Hey thank you.. Dr.Bob222 Sir . Can we do it like this : take calcium nitride in a beaker and add water. When water reacts with calcium nitride, Calcium hydroxide and ammonia gas is formed. Ammonia is collected by the upward delivery of air. Ammonia has a...

10 years ago

Sorry sir , But I didn't get you. I am just a 9th grade student and don't know about empirical formula and all. Can you just tell me sir what I need to do. please sir

10 years ago

Thank you sir for that.But how do we prove that the product formed is calcium nitride. I didn't get that..

10 years ago

1) We use the for a particular reason. It is used for a definite purpose. 2)We use a in front of consonants. It is used to denote singular nouns. SUppose. " a student , a bright child.. " etc 3) AN - We use it in front of vowels. a e i o u . however, some...

10 years ago

behaviour African elephant societies are arranged around family units. Each family unit is made up of around ten closely related females and their calves and is led by an older female known as the matriarch.[3] When separate family units bond, they form k...

10 years ago

thank you . but what about the 3rd part of the question ? sin^2A - sin^2B what do we need to do with it?

10 years ago

oh yeas. sorry for the turmoil

10 years ago

are these correct @DrBOb222 and @Steve 1) NaCl(aq) + AgNO3(aq) ¨ AgCl(s) + NaNO3(aq) 2) CaCl2(aq) + Na2CO3 (aq) ¨ CaCO3(s) + 2NaCl(aq) 3) K2SO4(aq) + Ba(NO3)2 (aq) ¨ BaSO4(s) + 2KNO3(aq) 4) Sr(NO3)2 (aq) + 2NaOH(aq) ¨ Sr(OH)2(s) + 2NaNO3(aq)

10 years ago

what is the process of separation?

10 years ago

ok. what do we need to do after both of the gases have been liquified???

10 years ago

can we do it this way : keep the mixture at less than 100 degree C , then the steam will condense into liquid water and co2 stays as gas