the first practical realisation of the metric system came in 1799, during the french revolution, when the existing system of measures, which had become impractical for trade, was replaced by a decimal system based on the kilogram and the metre.
the first one is high roller, the second one is singapore flyer, the third one is giant wheel.
answer: the increase in temperature of the nail after the three blows is 8.0636 kelvins. the correct option is (d).
kinetic energy of the hammer ,k.e.=
half of the kinetic energy of the hammer is transformed into heat in the nail.
energy transferred to the nail in one blow =
total energy transferred after 3 blows,q =
mass of the nail = 15 g = 0.015 kg
change in temperature =
specif heat of the steel = c = 448 j/kg k
the increase in temperature of the nail after the three blows is 8.1 kelvins.hence, correct option is (d).