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    What were the options for Q9?


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    (Original post by kingaaran)
    Here are all the answers:

    Q1:
    Question: What is conserved in an elastic collision?
    Answer: D - all quantities are conserved

    Q2:
    Question: The force-time graph
    Answer: B - the speed of the object 1.0 seconds later is 5.0 m/s.

    Q3:
    Question: What is the angular speed of a car wheel of diameter 0.400m with speed 108 km/h?
    Answer: B - 150 rad/s

    Q4:
    Question: Minimum and Maximum Tension
    Answer: D - 9.6N and 15N for the min and max tension respectively.

    Q5:
    Question: What is the true statement about an object performing SHM?
    Answer: D - acceleration and displacement are always 180 degrees out of phase.

    Q6:
    Question: What is the incorrect statement about the motion of the pendulum?
    Answer: C - the kinetic energy is maximum at T/2.

    Q7:
    Question: When is the resultant force on a mass-spring system minimum?
    Answer: D - at the centre of oscillation.

    Q8:
    Question: Which pendulum oscillates with the greatest amplitude?
    Answer: B - the one with the same length.

    Q9:
    Question: What is the gravitational force between X and Y when they are nearest to each other?
    Answer: B - 3F

    Q10:
    Question: What is the gravitational potential at the midpoint P between the two stars?
    Answer: C - (-4GM)/d

    Q11:
    Question: What is the height of the geosynchronous satellite?
    Answer: B - 3.6 x 10^(7) m

    Q12:
    Question: What happens to the force on X when +2nC is added?
    Answer: A - 2F in the direction X to Y

    Q13:
    Question: How does the magnitude of F vary with distance?
    Answer: C - straight line: it is uniform field.

    Q14:
    Question: What is the electric field strength at P, the centre of the square?
    Answer: A - zero

    Q15:
    Question: Which of these statements is correct?
    Answer: C - when moving from X to Y, the electric potential decreases

    Q16:
    Question: What is the electric potential at P?
    Answer: A - (-3Q)(8pi*e_(0) r)

    Q17:
    Question: How much work id sone when a +2.0nC is moved from R to S?
    Answer: B - 0.15uJ

    Q18:
    Question: Which of the options is a unit for (e_0)G?
    Answer: A - C^2 kg^(-2)

    Q19:
    Question: What is the voltage and charge across the capacitor?
    Answer: C - 96V, 2.9 x10^(-10) C

    Q20:
    Question: Which pair of graphs show how the pd and current of a charging capacitor vary with time?
    Answer: A - pd increasing, current decreasing

    Q21:
    Question: What is the magnitude and direction of the magnetic force on the conductor?
    Answer: A - 0.075N vertically upwards

    Q22:
    Question: Through what angle, and direction, should the coil be rotated for flux linkage to be a (i) maximum and (ii) a minimum?
    Answer: D - pi/3 anticlockwise for maximum, pi/6 for minimum

    Q23:
    Question: What is the emf induced between the ends of an axle 1.5m long?
    Answer: C - 1.2 x 10^(-3) V

    Q24:
    Question: What is the ratio of flux linkage and current through the secondary coil in relation to the primary coil?
    Answer: B - flux linkage >1, current <1

    Q25:
    Question: What is the main reason of high voltages in power lines?
    Answer: D - increasing the voltage decreases the current.

    Comment how many you got below. I got 24.
    Thanks! Can you post a picture of the paper please?
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    I think I got 22/25. Should only need 30/50 in Section B for an A.
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    I think its Y to X as well
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    (Original post by philip1997)
    24 happy with that
    Which question did you get wrong?
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    Was the potential one just using the simple mass*change in potential? Or did we have to use Q/kr to find the change in potential
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    i only got 17 everyone is saying they got 20 or over, i feel dissappointed
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    (Original post by perpetua)
    I think its Y to X as well
    That doesn't make sense if 2N is acting more from X to Y?


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    (Original post by Yo12345)
    What were the options for Q9?


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    2F, 3F, 4F or 5F
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    (Original post by Yo12345)
    That doesn't make sense if 2N is acting more from X to Y?


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    The force on X and from X acts towards Y


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    (Original post by Yo12345)
    The force on X and from X acts towards Y


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    I reckon that the force on X is exerted by Y, which repels X
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    (Original post by perpetua)
    I reckon that the force on X is exerted by Y, which repels X
    In that case resultant force would be zero


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    (Original post by Yo12345)
    In that case resultant force would be zero


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    The resultant force of..? Because there are only two charges of like sign...
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    (Original post by perpetua)
    The resultant force of..? Because there are only two charges of like sign...
    We know that 2N acts to the right. Both were attractive forces and the one from the left overpowers that of the right so field lines are to the right, magnitude.


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    (Original post by kingaaran)
    ...
    If you upload pictures of each question somewhere I'll give you infinite rep.
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    (Original post by Yo12345)
    We know that 2N acts to the right. Both were attractive forces and the one from the left overpowers that of the right so field lines are to the right, magnitude.


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    Positive charges* not attractive forces sorry


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    • Community Assistant
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    Community Assistant
    Can you show question 11 please, I don't remember that one.
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    I will pay $ for pictures of each question
    • Thread Starter
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    (Original post by ombtom)
    If you upload pictures of each question somewhere I'll give you infinite rep.
    I predict 59 for an A*, 53 for an A, 47 for a B, 41 for C, 35 for D and 29 for an E.
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    (Original post by Yo12345)
    We know that 2N acts to the right. Both were attractive forces and the one from the left overpowers that of the right so field lines are to the right, magnitude.


    Posted from TSR Mobile
    Field line between X and Y are from X to Y. But as X is positive charge, it also has a field line from Y to X on the line YX extended. If we don't consider the fields, just two charges....
 
 
 
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