Podcast
Questions and Answers
Which of the following materials will be attracted by bar Q alone? (Select all that apply)
Which of the following materials will be attracted by bar Q alone? (Select all that apply)
Based on the observations, which of the following positions of the poles of these ring magnets is NOT possible?
Based on the observations, which of the following positions of the poles of these ring magnets is NOT possible?
Which of these nozzles will make the water from the pipe reach the FARTHEST, if the flow of water in the pipe is not changed?
Which of these nozzles will make the water from the pipe reach the FARTHEST, if the flow of water in the pipe is not changed?
In the given positions, who will be able to DIRECTLY view the lamp?
In the given positions, who will be able to DIRECTLY view the lamp?
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Which of the following is most likely the special design feature of the ball-pen?
Which of the following is most likely the special design feature of the ball-pen?
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Which of the following is likely to be TRUE about the weights of the hot piece P and the cold piece Q?
Which of the following is likely to be TRUE about the weights of the hot piece P and the cold piece Q?
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Study Notes
Bar Magnet and Material Interaction
- A bar magnet attracts another material, even if that material is unknown.
- The unknown material attracted to the magnet is most likely iron.
Ring Magnet Interaction
- Two ring magnets attract each other in some arrangements and repel in others, indicating opposite poles attract and same poles repel.
- It is NOT possible for a ring magnet to have a configuration where both the north and south poles are on the same side of the ring.
Water Flow from Nozzles
- The nozzle that makes the water reach the furthest is the one with a diameter narrower than the pipe.
- Narrower nozzles increase water pressure and velocity, resulting in longer distance travel.
Viewing a Lamp
- Only the people on the roof of the building (R) and the small structure above the building (Q) can directly view the lamp.
- People on the ground cannot see the lamp.
Special Ball-Pen
- The special ball-pen likely has a design feature that makes the ink flow easily towards the tip.
- This allows the pen to write regardless of the paper's position.
Iron Bar and Temperature
- The weight of a piece of iron does not change when it is heated or cooled.
- Heating expands the iron, but the mass remains the same.
Hollow Pipes in Water
- The water level in each pipe will depend on the diameter of the pipe.
- A wider pipe will have a higher water level compared to a narrower pipe, even when both are placed in the same depth of water.
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