A125 g block of an unknown substance with a temperature of 90.0°c is placed in a styrofoam cup containing 0.326 kg of water (c 4190 j/kg.°c) at 20.0 °c. the system reaches an equilibrium temperature of 22.4 °c. what is the specific heat, c, of the unknown substance if the heat capacity of the cup is neglected?

In which scenario is the least amount of work done on a crate? a force of 120 n moves it 25 m. a force of 115 n moves it 26 m. a force of 130 n moves it 22 m. a force of 125 n moves it 27 m.

Which of the following is the result of the nuclear weak force? the instability of large nuclei the repelling force between positively charged protons the structure of the atom certain types of nuclear decay

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.