A boiling pot of water (the water travels in a current throughout the pot), a hot air balloon (hot air rises, making the balloon rise) , and cup of a steaming, hot liquid (hot air rises, creating steam) are all situations where convection occurs.
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Which picture are you talking about?
The answer is B - Current Y has a greater potential difference, and the charges flow at a slower rate.
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Half mass car because it's traveling faster