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Author Topic: AS PHYSICS UNIT 1  (Read 5038 times)

Offline The Golden Girl =D

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Re: AS PHYSICS UNIT 1
« Reply #15 on: December 27, 2010, 01:19:07 pm »
Quote from: Vampire-Love4ever on December 27, 2010, 01:17:23 pm
Firstly, thanks for your help :D
I have a question regarding this.
Why will the drag be upwards? Shouldn't it oppose the motion of the balloon and be downwards?

My Bad  :-X , It'll Oppose the motion and hence Arrow Downwards =]
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Offline Vampire-Love4ever

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Re: AS PHYSICS UNIT 1
« Reply #16 on: December 27, 2010, 01:21:15 pm »
Quote from: Ari Ben Canaan on December 27, 2010, 01:16:18 pm
8. 5cos55 - F = 0

It is equal to zero since there is no acceleration.

Solving for F gives 2.87N
Thank you :D
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Offline Vampire-Love4ever

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Re: AS PHYSICS UNIT 1
« Reply #17 on: December 27, 2010, 01:22:24 pm »
Quote from: ~ The Golden Girl  ~ on December 27, 2010, 01:19:07 pm
My Bad  :-X , It'll Oppose the motion and hence Arrow Downwards =]

Are you sure? Cos I am confused :S

I am just guessing here =/
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elemis

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Re: AS PHYSICS UNIT 1
« Reply #18 on: December 27, 2010, 01:24:52 pm »
9. (a) this question deals wit projectile motion.

The range of a projectil is equal to horizontal velocity * time taken

Using s = ut + 0.5at^2

15=0.5*9.8*t^2

Solving for t we get 1.75s

Using above equation : 12 * 1.75 = 21m

(b) the following answer may or may not be right. If you have the actual answer please tell me if I'm right.

Considering the horizontal and vertical components of motion we form a right angle triangle with the hypotenuse equal to the resultant velocity.

Hence, 12^2 +18.62^2 = 490.7

Thus, resultant velocity is 22.2 ms^-1
« Last Edit: December 27, 2010, 01:33:26 pm by Ari Ben Canaan »
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Offline The Golden Girl =D

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Re: AS PHYSICS UNIT 1
« Reply #19 on: December 27, 2010, 01:25:44 pm »
Quote from: Vampire-Love4ever on December 27, 2010, 01:22:24 pm
Are you sure? Cos I am confused :S

I am just guessing here =/

I'm Sure ..Cuz the Drag/Air resistance ALWAYS Opposes the Motion of the object. and hence In this Case ; Since It goes Upwards the Air Resistance is Downwards ;)
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Offline Vampire-Love4ever

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Re: AS PHYSICS UNIT 1
« Reply #20 on: December 27, 2010, 01:29:07 pm »
Quote from: ~ The Golden Girl  ~ on December 27, 2010, 01:25:44 pm
I'm Sure ..Cuz the Drag/Air resistance ALWAYS Opposes the Motion of the object. and hence In this Case ; Since It goes Upwards the Air Resistance is Downwards ;)

I get it :)
So. . . Weight and drag will act downwards will Upthrust will act upwards. Right?
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Offline The Golden Girl =D

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Re: AS PHYSICS UNIT 1
« Reply #21 on: December 27, 2010, 01:32:57 pm »
Quote from: Vampire-Love4ever on December 27, 2010, 01:29:07 pm
I get it :)
So. . . Weight and drag will act downwards will Upthrust will act upwards. Right?

Yes =]
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elemis

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Re: AS PHYSICS UNIT 1
« Reply #22 on: December 27, 2010, 01:34:33 pm »
Quote from: Vampire-Love4ever on December 27, 2010, 01:29:07 pm
I get it :)
So. . . Weight and drag will act downwards will Upthrust will act upwards. Right?

Check your messages. Just click on my messages at the top of this page.
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elemis

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Re: AS PHYSICS UNIT 1
« Reply #23 on: December 27, 2010, 01:38:33 pm »
10. Range = horizontal velocity * time

0.8 = 1.5 t

T= 8/15

S=0.5*9.8*(8/15)^2

S= 1.39 metres
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Offline Vampire-Love4ever

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Re: AS PHYSICS UNIT 1
« Reply #24 on: December 27, 2010, 01:46:20 pm »
Quote from: Ari Ben Canaan on December 27, 2010, 01:38:33 pm
10. Range = horizontal velocity * time

0.8 = 1.5 t

T= 8/15

S=0.5*9.8*(8/15)^2

S= 1.39 metres

Correct!
Thanks! =)
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elemis

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Re: AS PHYSICS UNIT 1
« Reply #25 on: December 27, 2010, 01:50:05 pm »
11. I won't do this one because it's too simple. Just think about it or find the formula on the net.
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elemis

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Re: AS PHYSICS UNIT 1
« Reply #26 on: December 27, 2010, 01:54:28 pm »
12. USe pressure = force/area

10000000/(2.2*10^-4) = 4.55*10^6
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Offline Vampire-Love4ever

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Re: AS PHYSICS UNIT 1
« Reply #27 on: December 27, 2010, 02:13:58 pm »
Quote from: Ari Ben Canaan on December 27, 2010, 01:50:05 pm
11. I won't do this one because it's too simple. Just think about it or find the formula on the net.

I know we have to use pi * r^2 * h

but my answer was different from the mark scheme answer.
just temme what u get here?
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Offline moraish

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Re: AS PHYSICS UNIT 1
« Reply #28 on: January 07, 2011, 10:17:00 am »
hey guys..i too am sitting for physics this exam..just wondering, is there 2008 jan and june past paper for new syllabus.. i've searched all over the net and have no luck? can some one help.thanks! :)
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Offline Vampire-Love4ever

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Re: AS PHYSICS UNIT 1
« Reply #29 on: January 09, 2011, 12:14:10 pm »
Quote from: moraish on January 07, 2011, 10:17:00 am
hey guys..i too am sitting for physics this exam..just wondering, is there 2008 jan and june past paper for new syllabus.. i've searched all over the net and have no luck? can some one help.thanks! :)

Nope. There isn't one.
First exam for physics [new syllabus] was Jan 2009.

:)
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