2. A 4.25kg of heated piece of metal is dropped into 8kg of water initially at 12.0°C. The temperature of the water at thermal equilibrium is 14.25°C.
You know that the change in the temperature for the metal is 74°C. Using
the table of specific heat capacities, what metal or metals is the unknown
most likely to be? (Table is on page 2) ROUND TO THE NEAREST TENTH FOR
ANY CALCULATION.

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s. part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.