Question 15, chap 115, sect 10 part 1 of 1 10 points contains a The hypodermic s

Question

Question 15, chap 115, sect 10 part 1 of 1 10 points contains a The hypodermic syringe medicine with the same density of water. The barrel of the of 3.64739 x 10 m. The cross-sectional area of the needle is 1.64358 x 10-8 m2. In the absence of a force on the plunger, the pres- sure everywhere is 1.0 atm. A force of mag- nitude 1.34535 N is exerted on the plunger, making medicine squirt from the needle syringe has a cross-sectional area 1.345 01 P2 Find the medicine's flow speed through the needle. Assume that the pressure in the nee- dle remains at atmospheric pressure, syringe is horizontal, and that the speed of the emerging fluid is the same as the speed of the fluid in the needle. Answer in units of m/s. that the

Explanation / Answer

F = 1.34535 N, p = 1000

A = 3.64739 * 10-5 m2

P1 - P2 = F / A1 = 1.34535 / (3.64739 * 10-5) = 3.69 * 104 Pa

3.69 * 104 Pa = 1/2 * p * v22

v22 = 2 * 3.69 * 104 / p

v22 = 2 * 3.69 * 104 / 1000

v = 8.59 m/s

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