Author Archives: Anonymous
A 10 kg lead brick is dropped from the top of a 400 m tower….
A 10 kg lead brick is dropped from the top of a 400 m tower. Assuming all the gravitational potential energy the brick started with goes to heat it, what is its temperature increase? The specific heat of lead is 130 J/kg C ° .
Read DetailsA 75 year old woman is brought to the ER complaining of fati…
A 75 year old woman is brought to the ER complaining of fatigue, confusion, nausea and vomiting, and back pain. After physical examination, laboratory tests including CBC with diff, PT/INR, PTT, CMP, and UA are ordered. Her test results revealed the following: Hgb= 9 g/dL Serum creatinine= 2.4 mg/dL (0.2-1.2 mg/dL) Calcium= 12.5 (normal 8.5-10.2 mg/dL) The patient was admitted. IV hydration and pamidronate were started to lower her calcium levels. Upon further evaluation, serum protein electrophoresis revealed an M spike measuring 5.1 g/dL. Bone marrow examination revealed 45 % plasma cells. A radiological skeletal survey revealed lytic lesions in the femurs, arms, pelvis, and skull as shown below. What is the most likely diagnosis ?
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