Acord has original length of 100 cm is pulled by a force. The change in length of the cord is 2 mm. Determine the strain?​

Which atomic model was proposed as a result of j. j. thomson’s work?

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.

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?