elastic force on the balloon
f = kx
here we know that
k = 115 n/m
x = 0.8 m
f = 115 n/m (0.8m) = 92 n
elastic potential energy
u = 36.8 j
by energy conservation
initial kinetic energy = final potential energy
u = ke
as we know that
by solving above equation we have
cold temperature can't "flow" into a warmer object, in this case, the person's hand. the heat energy of the hand gets transferred to the colder object, the ice.
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).