A 30-kg iron block and a 40-kg copper block, both initially at 150oC, are dropped into a large lake at 15oC. Thermal equilibrium is established after a while as a result of heat transfer between the blocks and the lake water. Determine the total entropy change for this process.

the entropy change for the process is 8.736kj/k

Explanation: the first step is to get the entropy change for iron, copper and that of lake as well.  To get further explanation  please see attached a solved copy of the problem

the warning light flashes for a second or two when the engine starts. if it stays on, there's must be something wrong with the coolant. you should never dare to continue driving when the light is on. pull over as soon as possible and shut the engine off.

hope this is what you're talking about

import math

x=int(input("enter a number: "))

print (math.sqrt(math.fabs(