Determine how deep is the lake
At a height of 20 meters above the surface of a lake, a sound pulse is generated. The echo from the bottom of the lake returns to the point of origin 0.160 s later. The air and water temperatures are 20°C. How deep is the lake?
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Two charged bodies exert a force of 0.610 N on each other. If they are moved so that they are one-fourth as far apart, what force is exerted?
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Ann is driving down a street at 55.0 km/h. Suddenly a child runs into the street. If it takes Ann 0.75 s to react and apply the brakes, how many meters will she have moved before she begins to slow down?
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