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Firstly, the Ka of acetic acid is 1.8 x 10^-5 (not 1.8 x 10^-8). It's an acidic buffer

pH = pKa + log (S/A)

where S = concentration of the salt
A = concentration of the acid

Ka =...

Average Speed = Total distance traveled / Total time taken

In the first part, the velocity is 25 m/s and time taken is 30 min = 1800 s
So, the distance traveled = velocity x time = 25x1800 =...

Whom do you love? Did you start dating the second guy only because your ex was with someone else?

After the collision with the wall, the hammer moves with the same velocity but in the opposite direction.

From this point of time, the hammer came to rest in 0.1 s. The final velocity is zero and...

No, my parents had done that many times(different reasons, though), but I never moved out.
They are your guardians and they have the responsibility to guide you through the right path.

Your uncle...

Yes, waiting is the only thing you can do now. Also, that guy doesn't look safe for you to move out. As I said earlier, if you neglect what these experts are saying, then you might regret your...

First thing.. read this post "https://www.askmehelpdesk.com/teens/all-teens-wondering-if-they-should-have-sex-teen-perspective-303617.html"

Don't ruin your life. I can't really say if you are...

They follow a parabolic trajectory towards the direction of the positively charged plate.

F = ma
So, a = F/m
v = at
11.2 = F/70 (t=1)
F = 784 N = 80 kgf

Use (x-y)^2 = x^2 + y^2 - 2xy
Put x = 3a and y = 7b

Hahaha... I used Hindi just to give him my original voice. I thought he also might well feel native.
There's nothing like what your grandparents did!!

Bhai, agar uska pappa samaj nahi pa rahe hai though aur kuch solution nahi hai. Aap dono ke beech mein agar sache pyaar hai tho(ye aap dono ko hi pata hai) shayad ghar se bahar aana hi sahi hoga.
...

Welcome :-)

Welcome :-)

Sometimes, all the information given may not participate in the solution.

The conditions are:
1) the witness is right and the car is blue
2) the witness is wrong and the car is blue.

The...

Any doubt? Ask me now. Don't hesitate.

In Shawn's home town of Oakland, there are two cab companies - Green Cab and Blue Cab. All the Green Cab cars are painted green and all the Blue Cab cars are blue. Green Cab has 85% of all the cabs...

It doesn't state whether the witness was right or wrong, but it clearly states that the witness claims the cab to be blue.

The witness didn't say that the cab was green. If he says so, then we...

y = x^2 + 4

Because the cab has to be blue, the witness should be right. If he is wrong, then it couldn't have been blue cab.

I think I'm right.. two conditions arise when probablity of truth or false is given instead of the given one

I think its 0.8; I don't see any hidden tricks in it.
If the witness is right, then the cab is blue. So, there is only one condition.
For the cab to be blue, witness should be right.
the witness...

I really didn't understand your examples, but may be I can help this way.

- x - = +
+ x + = +
- x + = -
( x denotes multiply)

For example : -3 x -3 = (- x -)(3x3) = +9
...

Then what is conditional?

Oh okay... now I understood what is past before past exactly.

I have to write my application essays, SAT essay and TOEFL essay. So, I am incredibly worried particularly about these phrases and words.

What is actually "conditional" ?

Sorry, am I annoying you?

Okay what about "have" and "had"?

I've studied many articles about him..

I think it should start with "I had" but I don't know the reason. Because it is past (more past)?
If it had occurred...

Doesn't "had had" fit into that? It represents past tense.

Doesn't "had had" fit into that sentence? It represents past tense.

Rohini : Raj appears quite prosperous. He is quite lucky.

Lasya : He has had a thin time too. Days were when he found it difficult to meet the expenses of his children's education.

I was...

* a thin time
I missed "a" in both the sentences

I just want to know when to use those words.

Today I came through a sentence:

He has had thin time too.

Why can't it be:

He had had thin time too.

Wondergirl, are you there?

Hey its you whom I was talking about...

I am confused with the usage of "have had" and "had had". When can I use them?

"have" and "had" too...

Ex: I had written this: (about something that happened a few months ago)

I have...

the last term is x+3d

If you take the terms in A.P as x-3d, x-d ,x+d and x=3d, you can easily go through the solving step.

Its nothing but the resultant of those two velocity vectors which are separated by 30 degrees.

resultant^2 = 50^2 + 30^2 + 2(30)(50)cos30

Suppose x amount of $4500 gets 4% interest and the remaining y amount gets 5%.
Then we get two equations in two variables as
x+y=4500 and 4x+5y=21000

They are called geostationary satellites.

Come on fellas, it means that such a satellite appears to be at rest with respect to a particular point on earth. Its 36000km

What are " 5.7 1016" and "6.5 1016"? We need moles or any related units to solve this but I am unable to find such.

In #2, as for the first part a, I cannot draw any diagram.

b. your initial velocity on bike is zero, acceleration is 2 m/s^2 and you need to gain a velocity of 2 m/s. By first equation of motion,...

For #1, car's velocity before it strikes the wall is 25 m/s and it does not change during the collision, if the collision is elastic. It cannot be inelastic as we do not know the mass of the wall. It...

This cannot be answered without drawing a free body diagram of the mass. But I will try to tell you as better as I can. Try to draw it as I direct you.

DRAW A MASS SUSPENDED FROM A POINT BY A...

I think, jumping can be considered to be projectile and then, the jump distance becomes the range of projectile.

Range is inversely proportional to the "acceleration due to gravity(g)"

So,
...

its exactly S = ut + (t^2)a/2

the initial velocity, say "u", is 12 m/s and its acceleration, say "a", is -1.6 m/s^2.
Let the time taken be t, then

Distance traveled = ut + at^2/2

Now, you can solve both the questions.