Edexcel PHYSICS Doubts

[The Golden Girl =D]

Hey can anyone Help with these Question?
Thx

The Teacher said its Something Completely New but we need to know it -.-

I hope the Pictures are Not Blurry =]

Attached .

[The Golden Girl =D]

Ohh I skipped One part :S

Lift Weight = F

4.3 - 0.44 = 3.86 N

Don't Rep Me just Pray for me =]

[Malak]

Ohh I skipped One part :S

Lift Weight = F

4.3 - 0.44 = 3.86 N

Don't Rep Me just Pray for me =]

Thx alot

Inshallah we all will do good...! Ameen

I hav another Q By the way

[The Golden Girl =D]

Thx alot

Inshallah we all will do good...! Ameen

I hav another Q By the way

So Since they said HALF the time is spent Accelerating and HALF the Time is spent accelerating  .

Acceleration .....Deceleration Means that HALF the Journey the Train was Accelerating and the Other HALF it was decelerating Hence Distance is HALVED too

1. 5000 Km splits to :

2500,000  and 2500,000

2.3600 Seconds Splits to :

1,800 and 1,800

Okay Now we Start With the Calculation ;

S = u + 0.5at
2500,000 = 0 + a * (1,800)²

a = 2*2500,000/(1,800)²
a = 1.54 ms^-2
   Which is About 2 ms^-2

Ameen =]

[Vampire-Love4ever]

If an force-extension graph shows:
(i) Curved line passing through the origin.
(ii) Straight line not passing through origin.
Is Hooke's law obeyed in each case?

[Vampire-Love4ever]

If a material exceeds limit of proportionality but not the elastic limit. Will it regain it's original length?

[Vampire-Love4ever]

Please explain these two questions!

[The Golden Girl =D]

Q7 is Explained at the beginning of this page. *first post to be exact*

Q3 :We are NOT going to Consider the Weight in our calculation since it's NOT in the direction of the force .

So , work done = force * distance in the direction of the force
                     = 20 N * (8*1000) m
                     = 160,000 J

Hence Answer is  C .

[The Golden Girl =D]

If an force-extension graph shows:
(i) Curved line passing through the origin.
(ii) Straight line not passing through origin.
Is Hooke's law obeyed in each case?

it MUST pass through the Origin and hence ii) is NOT correct.

it should be a straight line to show the fact that they are directly proportional and Hence i) is NOT correct *I'll let someone confirm this though*

[Malak]

it MUST pass through the Origin and hence ii) is NOT correct.

it should be a straight line to show the fact that they are directly proportional and Hence i) is NOT correct *I'll let someone confirm this though*

About passing through the origin..I thinkt the same too but then this question confuses me

Q19 2010 Jun

The question asks if hookes law is obeyed and in the Ms it says that it does obey hooke's law

[elemis]

About passing through the origin..I thinkt the same too but then this question confuses me

Q19 2010 Jun

The question asks if hookes law is obeyed and in the Ms it says that it does obey hooke's law

Thats not a force EXTENSION graph in the diagram. It shows data for force plotted against TOTAL length.

Hence, hookes is law is obeyed.

[Vampire-Love4ever]

Thats not a force EXTENSION graph in the diagram. It shows data for force plotted against TOTAL length.

Hence, hookes is law is obeyed.

So, they just showed the total length in the graph. Not the extension?

[The Golden Girl =D]

first time they do that actually ,but yes.

[Vampire-Love4ever]

first time they do that actually ,but yes.

Thanks for your help!

I have one more doubt please :$

Q- What is the relationship between the average velocity of the cyclist and the average velocity of the car for the time interval covered by the graph?
...

[The Golden Girl =D]

Thanks for your help!

I have one more doubt please :$

Q- What is the relationship between the average velocity of the cyclist and the average velocity of the car for the time interval covered by the graph?
...

My Answer is :   They are the Same .

Why : it's because of the fact that they have the Same distance and same time .=]