A5.0-kg block of wood is placed on a 2.0-kg aluminum frying pan. how much heat is required to raise the temperature of both the wood and the pan from 20°c to 45°c? (note: the specific heat wood is 1700 j/kg ·°c and of aluminum is 900 j/kg ·°c.)

Heat required to raise the temperature of a given system is

here we know that

m = mass

s = specific heat capacity

= change in temperature

now as we know that

mass of wood = 5 kg

mass of aluminium pan = 2 kg

change in temperature = 45 - 20 = 25 degree C

specific heat capacity of wood = 1700 J/kg C

specific heat capacity of aluminium = 900 J/kg C

now here we will find the total heat to raise the temperature of both

So heat required to raise the temperature of the system is 257500 J

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

that would be because of both gravity and friction. so     c