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But the time of flight is equal for both of them? That's what I thought (hence my answer for B). Acceleration due to g is equal for both and the vertical velocity of both will be equal throughout the flight.9. D depends on the time of flight or height
12 isn't the best question tbh but if you imagine the magnetic field as passing all the way through the disk, it's like it passes through the Infinetly thin surface areas from one side to the other, also note that larger coils (like in conducting lines) are thicker to reduce resistance, well the thicker disk will have less resistance and hence the eddy currents will be able to move more freely12- here I'm more interested about flux as the induced emf will be dependent on the flux. Does thickness increase flux? You're statement "I assume a larger area will allow more " doesn't really apply since the area of the disc experiencing flux is the same in both discs.
14. I'm confused on your response. Did you make a typo with D?
16. This makes sense but the other two options I made also make sense to me. Why are they wrong?
Cheers for your answers btw, really appreciate it
Assuming there is no air resistance then yeh it's bI would put b for 9
Which of the following would not increase the size of the deflection observed by the students?LOL, just realised 15 is wrong as it's an electron. Should be D.
I still don't understand your reasoning. 14 D is increasing armatures which I don't see provide a constant torque. Unless you mean 14 A since you seem to be talking about increasing coils (which implies increasing the turns?)14 is d because the coils will be cutting the field on a more regular basis
A) This is an ideal transformer so the flux is already at a maximum and the change in flux doesn't increase. If you mean the voltage is greater then this means the current is decreased and deflection is not increased.Which of the following would not increase the size of the deflection observed by the students?
(A) Increasing the number of turns in the secondary coil - the change in flux is greater , increasing deflection
(B) Increasing the voltage supply - again the change from 0 to 2v is greater then say 0 to 1v
(C) Decreasing the time taken to close the switch
(D) Increasing the size of the resistor- Best Answer: Use the V = I x R. If you have a power supply at a certain voltage, that won't change with adding more resistance. What will change is the current. For a set voltage (V), if resistance (R) goes up, current (I) has to come down to keep the equation balanced. So now the voltage is higher in the primary coil!
Wouldn't 8 be b) because the 2m is heavier so it drops faster (air resistance makes the m drop slower)? Or do we assume there is no air resistance?Does anyone have answers for the multiple choice section just so I can compare?
Mine were:
1. A
2. B
3. D
4. A
5. Not even sure for this one
6. D
7. There was no Q7.
8. C
9. B
10. B
11. C
12. A?
13. C
14. A or B?
15. C
16. A or D?
17. B
18. A
19. C
20. B
I could be wrong about most of 'em but meh. Ones with 2 options I couldn't decide between them as they both seemed right and for 12 I had read this thread and the answer was said to be C, but I wasn't sure about that due to my current and perhaps incomplete understanding of flux. Would like to discuss this one (and any others I get wrong).
C, because in physics the theoretical model disregards air resistance. This is proven by Galileo, that any object regardless of mass in the same gravitational field will fall at the same time as objects will accelerate at the same rate 'g'.Wouldn't 8 be b) because the 2m is heavier so it drops faster (air resistance makes the m drop slower)? Or do we assume there is no air resistance?
Yeah but the question doesn't say if there is air resistance, so it's weird. It can still accelerate at the same rate but air resistance makes it fall differently. Gonna have to ask Chris about it.C, because in physics the theoretical model disregards air resistance. This is proven by Galileo, that any object regardless of mass in the same gravitational field will fall at the same time as objects will accelerate at the same rate 'g'.
Basically with HSC Physics projectiles, they generally expect you to assume there's no air resistance unless explicitly stated otherwise.Yeah but the question doesn't say if there is air resistance, so it's weird. It can still accelerate at the same rate but air resistance makes it fall differently. Gonna have to ask Chris about it.
Oh ok thanks for clearing this upBasically with HSC Physics projectiles, they generally expect you to assume there's no air resistance unless explicitly stated otherwise.
I got D for question 5Does anyone have answers for the multiple choice section just so I can compare?
Mine were:
1. A
2. B
3. D
4. A
5. Not even sure for this one
6. D
7. There was no Q7.
8. C
9. B
10. B
11. C
12. A?
13. C
14. A or B?
15. C
16. A or D?
17. B
18. A
19. C
20. B
I could be wrong about most of 'em but meh. Ones with 2 options I couldn't decide between them as they both seemed right and for 12 I had read this thread and the answer was said to be C, but I wasn't sure about that due to my current and perhaps incomplete understanding of flux. Would like to discuss this one (and any others I get wrong).