Water has a specific heat capacity nearly nine times that of iron. suppose a 50-g pellet of iron at a temperature of 200∘c is dropped into 50 g of water at a temperature of 20∘c.
when the system reaches thermal equilibrium, its temperature will be
a. closer to 20∘c.
b. halfway between the two initial temperatures.
c. closer to 200∘c.

a. closer to 20∘C

Explanation:

= mass of pallet = 50 g = 0.050 kg

= specific heat of pallet = specific heat of iron

= Initial temperature of pellet = 200 C

= mass of water = 50 g = 0.050 kg

= specific heat of water

= Initial temperature of water = 20 C

= Final equilibrium temperature

Also given that

Using conservation of energy

Energy gained by water = Energy lost by pellet

hence the correct choice is

a. closer to 20∘C

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.

f=ma newton's second law 7x8=56n