- #1
chanella35
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1. The tangential frictional force exerted by a band brakes on a rotating metal drum of circumference 0.25m is found to be 20N. If the mass of the drum is 0.4kg and its specific heat capacity is 0.35 kJ/kg K, calculate the number of complete revolutions of the drum are required to increase its temperature by 5.0 K.
Q= mcT
W=F*d
my attempt:
Q= mc[delta]T
W=F*d
f*d=mcT
20*d=400g*0.35*5
20d= 700
d=35
revolutions = 35/.25=140 or 1.4*10^2
^^^^^is that correct?
Q= mcT
W=F*d
my attempt:
Q= mc[delta]T
W=F*d
f*d=mcT
20*d=400g*0.35*5
20d= 700
d=35
revolutions = 35/.25=140 or 1.4*10^2
^^^^^is that correct?