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A Mother massages her palms to warm them up and places them on the cheeks of her
child with force 5.0 N to keep the child warm on the chilling night. If arms move the
distance of 16 cm as she moves her hands back and forth for the eight times with the
kinetic friction of 0.45, calculate the internal energy of the hands if no heat is lost into the
surroundings.
(a) 1.6 J
(b) 3.1 J
(c) 2.9 J
(d) 4.8 J

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