16.5 Exercise 40

Use the Appendix D for the next two exercises

On its highest power setting, a microwave oven increases the temperature of 0.400 kg of spaghetti by $45.0 ° \text{C}$ in 120 s. (a) What was the rate of energy absorption by the spaghetti, given that its specific heat is $3.76 \times 10^{3} \text{J}/\text{kg} \cdot ° \text{C}$ ? Assume the spaghetti is perfectly absorbing. (b) Find the average intensity of the microwaves, given that they are absorbed over a circular area 20.0 cm in diameter. (c) What is the peak electric field strength of the microwave? (d) What is its peak magnetic field strength?