A) The student places 0.5 kg potato into a pan of water. During cooking, the temperature of the potato increases from 20°C to 100°C. The specific heat capacity of the potato is 3400 J/KG. Calculate the change in the thermal energy of the potato. Use equation: Change in thermal energy= mass x specific heat capacity x temperature change . IVE GOT THE ANSWER FOR THIS BUT I NEED THIS NEXT QUESTION/:: question B : why is the energy supplied by the cooker greater than the calculated in part A ? please help

The frequency of a tuning fork can be found by the method shown. a long tube open at both ends is submerged in a beaker of water, and the vibrating tuning fork is placed near the top of the tube. the length l of the air column is adjusted by moving the tube vertically. the sound waves generated by the fork are reinforced when the length of the air column corresponds to one of the resonant frequencies of the tube. the smallest value for l for which a peak occurs in sound intensity is 7 cm. l what is the frequency of the tuning fork? the speed of sound in air is 345 m/s. answer in units of hz