Leaving Cert Quiz

alan4cult

Overheal wrote: »

This also holds true for the conservation of energy, so that

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>> the Energy before the reaction = Energy after

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>> Energy of the bullet = Energy of the gun

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>> (1/2*m*v^2 = 1/2*m*v^-2) so you can make the same arguing point. You may assume no energy is lost in the reaction to outside influences (heat, light, sound, etc.) unless the question specifies there is energy lost in the reaction.

Well if energy of gun is equal to the energy of the bullet then you are saying that the kinetic energy of the bullet is the same as that of the guns but it isn't?

You see the Conservation of Energy has being misused here.
TOTAL ENERGY BEFORE = TOTAL ENERGY AFTER
Chemical Energy stored in Bullet = Kinetic of Gun + Kinetic of Bullet + sound/heat/etc.

But, by means of example, one can see that the kinetic energies are not necessarily split 50:50 between bullet and gun.

Kinetic Energy depends on both mass and velocity. But as a previous poster said the velocity is the primary factor as it is squared. I would suggest that is why the question stated much greater than.

As for answer I wouldn't be sure what to write down!

Past P of boire is "bu" I believe

What is the speed of light?

daggy

Woah! What an answer to my question...
Um.. C = 3x10^8 m/s

Hey hey, here
anyone wanna give a shot at proving the remainder theorum.Lol.

Cokehead Mother

What's the remainder theorem? Is it on the LC course? :eek:

Is it that x-k thingy??

daggy

Cokehead Mother wrote: »

What's the remainder theorem? Is it on the LC course? :eek:

Is it that x-k thingy??

aye that is precisely it! dont sound so shocked ok, chill!

Cokehead Mother

Aaah right. When I say xn, I mean x^n

So let f(x) = ax3 + bx2 + cx + d

Then f(k) = ak3 +bk2 +ck + d

f(x) - f(k) = ax3 + bx2 + cx + d - [ ak3 +bk2 +ck + d ]

f(x) - f(k) = a(x3 - k3) + b(x2 - k2) + c(x - k)

f(x) - f(k) = a(x - k)(x2 + xy + k2) + b(x - k)(x + k) + c (x - k)

f(x) - f(k) = {x - k}[a(x2 + xy + k2) + b(x + k) + c]

Thus, x - k is a factor of f(x) - f(k)

If f(k) = 0, then x - k is a factor of f(x)

Typing maths is so awkward. Who wants to prove the product rule?

alan4cult

Right product rule:

y = uv
ln(y) = ln(uv)
ln(y) = ln(u) + ln(v)
d/dx ln(Y) = d/dx ln(u) + d/dx ln(v)
1/y(dy/dx) = 1/u(du/dx) + 1/v(dv/dx)
dy/dx = y/u(du/dx) + y/v(dv/dx)
dy/dx = uv/u(du/dx) + uv/v(dv/dx)
dy/dx = v(du/dx) + u(dv/dx)

Who wrote the poem "Gealt?" ?

Cokehead Mother

That proof looks lovely. We did it the f(x+h) way. It's a big mess.

They will accept the integration way?

Áine Ní Ghlinn

Define limiting friction.

Overheal

alan4cult wrote: »

Well if energy of gun is equal to the energy of the bullet then you are saying that the kinetic energy of the bullet is the same as that of the guns but it isn't?

You see the Conservation of Energy has being misused here.
TOTAL ENERGY BEFORE = TOTAL ENERGY AFTER
Chemical Energy stored in Bullet = Kinetic of Gun + Kinetic of Bullet + sound/heat/etc.

But, by means of example, one can see that the kinetic energies are not necessarily split 50:50 between bullet and gun.

Kinetic Energy depends on both mass and velocity. But as a previous poster said the velocity is the primary factor as it is squared. I would suggest that is why the question stated much greater than.

As for answer I wouldn't be sure what to write down!

Past P of boire is "bu" I believe

What is the speed of light?

take it up with your teacher by all means...

I'll have another stab:

TOTAL ENERGY BEFORE = TOTAL ENERGY AFTER

Chemical Energy = Kinetic Energy [+ loss]

The 2 bodies, are acted on by the same force: the explosion of the round in the chamber, (denoted by 1/2*m*v*^2).

Basic physics (you can use a number of formulas to show it but its common sense) would show that if the same force acts on a large body (relatively) and a small body, it requires less energy to accelerate the smaller mass. In this case, the bullet. Hence if the same force were to act equally on both masses, the inherited velocity of the smaller mass (bullet) would be greater than that of the larger mass (gun).

Timans

Shouldn't we just rename this thread the Science Quiz..

Cokehead Mother

No!

Cad é príomhtéama an dán 'Níl Aon Ní'?

Piste

Love for a place.


Grá don áit éigin.



The half life on an element is...?

daggy

Hahah back to the science it is.
Half life.. tum te tum. The amount of time it takes for half of a radioactive substance to decay?

Here : Cad is bri leis and seanfhocal seo:

" is fearr and slainte na and tainte "

Biodh do fhreagra i d'fhocail fein comh fada agus is feidir . lol lol.

Fuascailt

daggy wrote: »

Hahah back to the science it is.

" is fearr and slainte na and tainte "

.

Health is better than wealth Lets try some history... What was
Kevin O'Higgins' nickname?

turgon

Kevo??????

What was the name of the event where Italion Socialists secceded from the parliment after good old Benito Mussilini knocked off a few?????

Timans

turgon wrote: »

Kevo??????

What was the name of the event where Italion Socialists secceded from the parliment after good old Benito Mussilini knocked off a few?????

The Aventine Secession.

What are the factors affecting Price Elasticity of Demand?

Niamhd164

Timans wrote: »

The Aventine Secession.

What are the factors affecting Price Elasticity of Demand?

I cant answer this one!!:mad::mad::mad: What is is physics?? Heres one this is a quote from which L.C poet

'Wie war das moglich?'

And what does it mean......

Crania

To answer Timans' question first. The factors that affect PED are:
-the Number of Substitute Goods Available
-the percentage of income spent on the product
-whether the good is a neccessity or a luxury
-Goods in Joint Demand
-Durabilty of Product
Can't remember anymore of them, there's another two I think


In response to the last poster, Niamhd164, 'Wie war das Moglich?' was said by John Montague, can't remember the name of the poem though. It was the one with the images of the war on the screen which he saw as a child or something like that. It means 'How was that possible?'

I guess it's my turn to ask a question. History: Mention two ways in which Lyndon B. Johnson escalated the Vietnam war?

Timans

CoolCiaran wrote: »

To answer Timans' question first. The factors that affect PED are:
-the Number of Substitute Goods Available
-the percentage of income spent on the product
-whether the good is a neccessity or a luxury
-Goods in Joint Demand
-Durabilty of Product
Can't remember anymore of them, there's another two I think


In response to the last poster, Niamhd164, 'Wie war das Moglich?' was said by John Montague, can't remember the name of the poem though. It was the one with the images of the war on the screen which he saw as a child or something like that. It means 'How was that possible?'

I guess it's my turn to ask a question. History: Mention two ways in which Lyndon B. Johnson escalated the Vietnam war?

1. Through the passing of the Gulf of Tonkin Resolution 1964.
2. Through the beginning of 'Operation Rolling Thunder'.

Geography : Give an example of an MNC in Ireland and state amount employed by this MNC in Ireland.

Crania

Dell is an example of an MNC in Ireland and they employ 4500 nationwide. 3300 in Limerick alone, the largest production site outside of the USA, absolutely unbelievable!

Next question. Economics: Define National Income.

Fuascailt

Kevin O' Higgins = The Irish Mussolini...

National income is the total income earned by the residents of a country in one year.

Business: Explain McGregors theories X and Y

jennyq

Fuascailt wrote: »

Business: Explain McGregors theories X and Y

Theory X assumes that employees cannot be self-motivated & must be forced to work. Theory Y states that if workers are encouraged & rewarded they can become self-motivated in their work to do the best they can.

(on a side note, is it just mine or is everyone's business teacher obsessed with the idea of giving examples?)

Business again: Give two liquidity ratios

ian.f

Fuascailt wrote: »

National income is the total income earned by the residents of a country in one year.

National income is the amount of wealth created in an economy of a fixed period of time ( usually one year)

Marcus-Aurelius

1918 General Elections Ireland - History:D

Peleus

Cokehead Mother wrote: »

Define limiting friction.

Limiting friction is the maximum ammount of friction that can be called into play. i can't remember what that means but i remember that definition. haven't done statics in a while.

Cokehead Mother wrote: »

What are the factors affecting Price Elasticity of Demand?

PED is affected by:

Durability of Good (more durable, more inelastic)
Consumer Loyalty (more loyal customers, more inelastic)
Expensive Goods (more expensive, more elastic)
Speculation as to further price increases (more speculation more elastic)

not sure if that last one is correct and i can't remember the other ones

Peleus

ian.f wrote: »

National income is the amount of wealth created in an economy of a fixed period of time ( usually one year)

full definition is better:

National Income is the income which accrues to the perminant residants of a country through current economic activity over a certain period of time which is usually one year. It is also call Net National Product at Factor Cost.

Yuugib

Liquidity ratios

Current Ratio:
Current assets/current liabilities

Acid test ratio:
(Current assets - Closing stock)/current liabilities

Qs:
Define empowerment

Peleus

Yuugib wrote: »

Qs:
Define empowerment

I'm not sure about that one, its business i think. i'm gonna say, its 'giving businesses and corporations more economic power'




I have a question for all the physicists:
What is the differenc between Thermionic Emmision and Photoelectric Emission and give an expression for The Photoelectric Effect.

Cokehead Mother

Thermionic emission is the emission of electrons from the surface of a hot metal.

The photoelectric effect is the emission of electrons from a metal due to light a sutaible frequency falling on it.

hf = O + Max kinetic energy

where h = plank's constant
f = frequency of the light
O = work function

In English, what is "Oíche Nollaig na mBan"?

Peleus

Cokehead Mother wrote: »

Thermionic emission is the emission of electrons from the surface of a hot metal.

The photoelectric effect is the emission of electrons from a metal due to light a sutaible frequency falling on it.

hf = O + Max kinetic energy

where h = plank's constant
f = frequency of the light
O = work function

In English, what is "Oíche Nollaig na mBan"?

well done. I think it means womens christmas. Its the name of a poem some guy with TB wrote about the wind blowing out a candle and how it could symbolise his own death. I had a whole essay on the poem but i can't remember it anymore.

How bout this one? Explain how banks create credit. (economics)

ian.f

Peleus wrote: »

full definition is better:

National Income is the income which accrues to the perminant residants of a country through current economic activity over a certain period of time which is usually one year. It is also call Net National Product at Factor Cost.

You clearly have a Jesuit inferiority complex going on just because we got Kenno.