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AS Physics P1 MCQs Preparation Thread.

waleedsmz

waleedsmz

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MysteRyGiRl said:
umm cud u plz elaborate thora sa?? :S where do we get zero from? and can u solve Q no 15 too from da same ppr? thnx :)
Click to expand...

Sure. :)

When we draw a diagram of forces. We draw lines whose length are proportional to the magnitude of the forces, and if these lines make a closed triangle and the direction of each line is head to tails with the other line then the point on which the forces are acting are in equilibrium as shown below.

m-stats-triangle.jpg
15. The crane is lifting both the hook and the load. To calculate the total power used, we can calculate the individual powers used to lift each body.
By using power= force x velocity:
Hook: 1000 x 0.5
Load: 1000 x 9.81 x 0.5

By adding them up, the answer would be B.

Hope that helped. :)
 
Soldier313

Soldier313

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waleedsmz said:
A has a very large part with a constant gradient ( constant acceleration ) and this is not true since there is air resistance that gradually decreases the acceleration of the ball.
Click to expand...
yea agreed but doesn't air resistance cause the object to reach terminal velocity, hence making the answer A?
 
MysteRyGiRl

MysteRyGiRl

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waleedsmz said:
Sure. :)

When we draw a diagram of forces. We draw lines whose length are proportional to the magnitude of the forces, and if these lines make a closed triangle and the direction of each line is head to tails with the other line then the point on which the forces are acting are in equilibrium as shown below.

m-stats-triangle.jpg
15. The crane is lifting both the hook and the load. To calculate the total power used, we can calculate the individual powers used to lift each body.
By using power= force x velocity:
Hook: 1000 x 0.5
Load: 1000 x 9.81 x 0.5

By adding them up, the answer would be B.

Hope that helped. :)
Click to expand...

yes dat did thank u :D umm Q no 17 and 20 too plz?
 
omg

omg

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waleedsmz will u help me wid qsss 7.
as the ball is thrown horizontaly it will follow a parabloic path so y isnt the horizontal component of velicty remaining constant??
iv posted it many timesssssssssss didnt get any anssssssssss
 

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