If you can find the question paper, I believe you can find the mark scheme on the same website You should at least attempt the questions and ask on the questions that you do not know how to do.
If you can find the question paper, I believe you can find the mark scheme on the same website You should at least attempt the questions and ask on the questions that you do not know how to do.
I am assuming that these are questions that you have problems. I would give you hints rather than working out the answers for you.
Q4.
You are given the time interval between the two peaks of the waveforms. Time base setting is found by the formula number of divisions between the time intervalΔt
Precise values agree with each other; accurate values agree with a true value. Measurements are said to be precise if they yield very similar results when repeated in the same manner. It can be inferred from the uncertainty. A measurement is considered accurate if it yields a result that is very close to the true or accepted value. You need to "infer" from the "true value" and then interpret from the uncertainty.
You may want to pose what is the problem that you have with this question. It is about using the formula of torque many times and identifying which is clockwise moment or anticlockwise moment.
Q24
This question you need to be careful.
From the picture, you should be able to identify the x values.
Q26
Can convert 5 ms in terms of period. And note that point P takes T/2 period from -1.0 mm to +1.0 mm.
Since the oil drop is held stationary, the electric force acting on it must balance the weight of the oil drop. Equate them and rearrange the equation to find out the charge-to-mass ratio.
Q32
This question is expecting you to apply Kirchhoff’s current law: The sum of the currents entering any point in a circuit is equal to the sum of the currents leaving that same point.
The internal and external resistors are connected in series, this means that current in the internal and external resistors are the same.
There are a few formulas that you learn in practical electricity concerning power, resistance, current and potential differences. Use one of them to write the fraction.
Spoiler
Q37
The 2.0-Ω resistor and 6.0-Ω resistor are connected in parallel, so they should have the same p.d. across them. Using this info, you should be able to find the current in the 6.0-Ω resistor. Then you can find the total current in the current which is equal to current I delivered by the power supply. Next you can find the p.d. across the 1.5-Ω resistor using the total current and then sum up the p.d. across the 6.0-Ω resistor and p.d. across the 1.5-Ω resistor to find the voltage V.
Since the oil drop is held stationary, the electric force acting on it must balance the weight of the oil drop. Equate them and rearrange the equation to find out the charge-to-mass ratio. I tried but cant get it ......
Q32
This question is expecting you to apply Kirchhoff’s current law: The sum of the currents entering any point in a circuit is equal to the sum of the currents leaving that same point.
You may want to pose what is the problem that you have with this question. It is about using the formula of torque many times and identifying which is clockwise moment or anticlockwise moment.
Q24
This question you need to be careful.
From the picture, you should be able to identify the x values.
Q26
Can convert 5 ms in terms of period. And note that point P takes T/2 period from -1.0 mm to +1.0 mm.
Spoiler
For Q17 yes I ve tried the formula but still cant get 120Nm .......
You have to pose your working to know what is wrong with your calculation.
More hints: You don’t need to calculate the torque due to the two 20 N-force.
So there are left 3 pairs of forces. They form couple of moment. You can use the couple formula in Q15 to simplify the calculations.
Only one pair of forces is giving anticlockwise moment of forces.
Hi so sorry i reaally cant see the 3 forces . u meant one pair of forces is giving anticlockwise moment of forces means the 70N? But the wouldn it be 140N? CAuSE 70*2m?