Awell-insulated electric water heater warms 125 kg of water from 20.0° c to 53.0° c in 29.0 min. find the resistance of its heating element, which is connected across a 240-v potential difference.

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

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Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?