Melanocytes and keratinocytes work together in protecting the skin from UV damage when keratinocytes ________.  

The simple columnar epithelium that lines most of the digestive tract has which characteristic?  

A red blood cell placed in a hypotonic solution would ________.  

Which one of the following systems responds fastest to environmental stimuli?  

A good example of a positive feedback mechanism would be ________.  

The horizontal distance an object will travel depends only on the vertical components of velocity.

An ideal gas is adiabatically and reversibly expanded through a nozzle.  The gas enters with negligible velocity at 400 K and 0.12 MPa and leaves the nozzle at 0.1 MPa.  What is the velocity of the gas at the nozzle outlet in (m/s)?  The molecular weight of the gas is 40 g/mol. The heat capacity of the ideal gas is CP = 20 + 0.01T where CP is in J/mol K and T is in K.

Sir Isaac Newton’s Laws of Motion observe the fact that motion is related to force in a precise manner.

Scroll down to find two property charts for Refrigerant 12 that you should use for this problem.  Consider the portion of the refrigeration cycle shown below, for which Refrigerant 12 is the working fluid.  The system is in steady state, the mass flow rate of refrigerant around the cycle is 1 kg/s and the compressor is adiabatic with an isentropic efficiency of 60%.  Find the rate of heat removed (kW) in the condenser.      

Match the following abbreviations with the correct medication meaning.