Do your TYS!

Converging Lens: The 4 Key Scenarios

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Velocity-time and Displacement-time Graph for a ball being thrown up

Click here to view a video tutorial on the concept.

Will the whole lake be frozen during winter? At what temperature is water at its max density?

During summer, though the surrounding is hot, the water in the lake will not reach very high temperature mainly due to its high specific heat capacity. In general, cool water sinks as it is denser and warm water rises as it is less dense, the bottom of the lake will always be lower temperature compared to near the surface. The bottom of the lake may not necessary be 4 degree Celsius.