Answer: The calorimeter's heat capacity is 
Explanation:
This scenario assumes the amount of heat lost by the hot object equals the amount of heat gained by the cold object.
where,
= specific heat capacity of water = 
= specific heat capacity of calorimeter =?
= mass of water = 108.7 g
= mass of calorimeter = 108.7 g
= final temperature of the mixture = 
= initial temperature of the water = 
= initial temperature of calorimeter = 
Now substituting all provided values into the formula, we obtain
Hence, the heat capacity of the calorimeter is
1) The electric potential energy can be defined as the product of the electric potential and the associated charge:
where
q refers to the charge
V denotes the electric potential
In this scenario, the charge on the rod is
, and the potential energy is
, thus we may rearrange the earlier formula to find the electric potential at the tip:
2) Using this same formula, if the charge changes to
, the resulting electric potential will be:
The frequency detected is 394 Hz. This question pertains to the Doppler effect, outlined by the equation fo = {c + vo}/{c - vs} × f. Here, fo is the observed frequency, c denotes sound speed at 345 m/s, vo is the observer's velocity of 9.5 m/s, and vs refers to the source's velocity of -9.5 m/s (the negative indicates opposite directions). The source's frequency is given as 394 Hz. Substituting the values leads to fo = {345 + 9.5}/{345 + 9.5} × 394. Simplifying yields fo = (354.5/354.5) × 394 = 1 × 394 = 394 Hz.
