Qualification > Sciences

AS PHYSICS UNIT 1

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The Golden Girl =D:

--- 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?

--- End quote ---

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

Vampire-Love4ever:

--- 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

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Thank you :D

Vampire-Love4ever:

--- 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 =]

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Are you sure? Cos I am confused :S

I am just guessing here =/

elemis:
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

The Golden Girl =D:

--- 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 =/

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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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