A diesel locomotive holds 1500 liters of engine oil.  The oil specifications require 1 gram (1000 ppm) of zinc per liter of oil to protect the engine from excessive wear in the bearings and other internal parts.  At the two-month service interval, a locomotive engine is determined to have 1500 liters of oil that contains 0.8 grams of zinc per liter of oil.  Replacement oil with a concentration of 1.5 grams of zinc per liter is pumped into ther reservior at the rate of 10 liters per minute.  Well-mixed oil is removed from the engine at the same rate.  How many minutes should this process of replacing oil be allowed to continue to restore the oil to 1 gram of zinc per liter?  NOTE:  If the oil has an excess of zinc, it will damage the engine.   

One last time …

A nurse is caring for a client who is 12 hours postoperative and has a chest tube to a water-seal drainage system with suction. The nurse should intervene for which of the following observations?

A nurse is caring for a client who is experiencing excessive diarrhea. The client’s arterial blood gas values are pH 7.18, PaO2 98 mm Hg, PaCO2 45 mm Hg, and HCO3- 16 mEq/L. Which primary health care provider order does the nurse expect to receive?

A patient with severe diarrhea is admitted to the medical-surgical unit for hypovolemia. Which assessment would provide the most accurate way to evaluate fluid balance?

A sudden jerk sends a transverse wave pulse along the vine.  Find the velocity with which the wave travels.

Compute the solution to the equation below. y”’ – y = ex  Make no entries in the textbox below.

A client is admitted to the medical-surgical unit with fluid volume overload related to heart failure. The nurse is reviewing the plan of care. Which interventions are appropriate for managing this condition? (Select all that apply).

 A concave mirror has a focal length of 30 cm.  What is the position (in cm) of the object if the image is upright and is three times larger than the object?  (Select closest answer)

A 68-year-old client is receiving IV morphine for postoperative pain management. On reassessment, the nurse notes the client’s respiratory rate is 4 breaths per minute. The provider is notified immediately. If this respiratory pattern continues, which of the following ABG results is most likely?