Chapter 28, Problem 26P

(a)

To determine

The amount of energy deposited on a small sheet of water with a diameter of $0.10\text{ mm}$ and a thickness of $0.30\text{ mm}$, if a laser emits $20\text{ mW}$ of power during an interval of $100\text{ ms}$ and the light is focused on a spot with a diameter of $0.10\text{ mm}$.

(b)

To determine

The mass of a small sheet of water with a diameter of $0.10\text{ mm}$ and a thickness of $0.30\text{ mm}$, if a laser emits $20\text{ mW}$ of power during an interval of $100\text{ ms}$ and the light is focused on a spot with a diameter of $0.10\text{ mm}$.

(c)

To determine

The increase in the temperature of water by assuming that its heat capacity is $4180\text{ J/kg}{\cdot }^{°}\text{C}$, if, on a sheet of water with a diameter of $0.10\text{ mm}$ and a thickness of $0.30\text{ mm}$, a laser emits $20\text{ mW}$ of power during an interval of $100\text{ ms}$ and the light is focused on a spot with a diameter of $0.10\text{ mm}$.