Refrigerant 134a enters an air conditioner compressor at 4 bar, 20°c, and is compressed at steady state to 12 bar, 80°c. the volumetric flow rate of the refrigerant entering is 4 m3/min. the work input to the compressor is 60 kj per kg of refrigerant flowing. neglecting kinetic and potential energy effects, determine the magnitude of the heat transfer rate from the compressor, in kw.

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.