I need physics help pleasee!?

Kris

New member
1.calculate the energy needed to heat 4kg of lead from 25C TO 45C.

a.2.4
b.18
c.80
d.100
e.180


2.steam enters a turbine at 500K and exhausts at 300K. Calculate the maximum efficiency.
a.10
b.20
c.30
d.40
e.100
 
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