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AS Physics P1 MCQs Preparation Thread.

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Can somebody explain the effect of increase in diameter of a wire on extension????

Thank You
 
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http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s03_qp_1.pdf

in qs 3 the resultant is the line joining the two vectors and completing the triangle, or is the line coming from the middle of the vectors. Are both of these the resultants or not.

in qs 15, why is A the answer. The graph is decreasing so we know from a fact that air resistance increases with time so shouldnt it not be air resistance as a decreasing curve is being shown. HElp required in these questions please :)
 
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http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s03_qp_1.pdf

in qs 3 the resultant is the line joining the two vectors and completing the triangle, or is the line coming from the middle of the vectors. Are both of these the resultants or not.

in qs 15, why is A the answer. The graph is decreasing so we know from a fact that air resistance increases with time so shouldnt it not be air resistance as a decreasing curve is being shown. HElp required in these questions please :)

For question 3, use the paralellogram law i.e. the line coming from middle the two vectors, be careful about the angle u would use!

In Q15. When falling in air resistance, the graph of FORCE Y clearly indicates that resultant force has to be zero as the ball is reaching a constant velocity (Newton's first law).. As for FORCE X, it cannot be upthrust as upthrust in air negligible but since velocity was initially increasing, air resistance will also be increasing and when velocity is constant, so does air resistance.
 
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For question 3, use the paralellogram law i.e. the line coming from middle the two vectors, be careful about the angle u would use!

In Q15. When falling in air resistance, the graph of FORCE Y clearly indicates that resultant force has to be zero as the ball is reaching a constant velocity (Newton's first law).. As for FORCE X, it cannot be upthrust as upthrust in air negligible but since velocity was initially increasing, air resistance will also be increasing and when velocity is constant, so does air resistance.
but the graph shows a decreasing gradient.
 
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but the graph shows a decreasing gradient.
See, the thing you need to understand is that air resistance varies according to the velocity of the object.
Since initially, velocity was increasing, so did the air resistance, and when velocity became constant, so does the air resistance. Had the air resistance kept on increasing, the resultant force would not be zero.
 
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View attachment 12388

the answers B. But how? any description will be appreciated.thank you.

and can anyone tell the effects of changing any one one value will have on other values in d.sin(teta)=n.lamda
aah...c...keep dat formula in mind while solving such Questns... n(lambda)=d.sin(theta)
now...if the no. of lines per metre are increased so the grating spacing decreases ryt? (e.g. if there r 300 lines/metre, d1=1/300 and if there are 400 lines/metre, d2=1/400....so here d2<d1...get it?)
according to the formula, n is directly proportional to d so here "d" decreases and so does "n"
and sin(theta) is inversely proportional to "d" so theta increases here...so the answer is ==>B
i guess that shud b helpful.. :p
 
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Q14 use moments and the pivot as the rear wheel
so 10* 30k =20x which gives 15K (B)

Q35
answer is A because in tthe question it said there are 2 resistors so as one increases in resistance it requires more voltage so voltage across other one decreases
using formula V/E=R1/R1+R2 to test values you will get something similar to graph A

and if you did question 26 can you please show your working

26) 1/8 of a cycle = 0.125
each half a wave is taking 2s to complete as 18/9 gaps = 2s
2x0.125= 0.25
18x0.25 = 4.5s
 
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