We add 3.358 kJ of heat to a calorimeter that contains 50.0 g of water. The temperature of the water and the calorimeter, originally at 22.34 ◦C, increases to 36.74 ◦C. Calculate the heat capacity of the calorimeter in J/◦C. The specific heat of water is 4.184 J/g. ◦C

let that person have a turn to speak : )

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

i think it's letter a.