College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

تمرين 125

A hypodermic syringe has a plunger of area 2.5 cm 2 and a 5.0 × 10 - 3 -cm 2 needle. (a) If a 1.0-N force is applied to the plunger, what is the gauge pressure in the syringe's chamber (b) If a small obstruction is present at the end of the needle, what force does the fluid exert on it (c) If the blood pressure in a vein is 50 mm Hg, what force must be applied on the plunger so that fluid can be injected into the vein