1. CH14.Problems JH.131

3. T = Fb- mg = V * Density.air *g – V* Density.He *g = 0.0500 *9.8*(1.293- 0.1786) = 0.5461 N This tension is equivalent to a 50 gram What if the tension is a child you want to carry whose weight is 40kg. What would be the volume of He balloon? 40 kg g = V(D.air-D.He) g V = 40/(1.293-0.1786) = 36 m^3

9. A1 V1 = A2 V2 V2 = A1/A2 V1 = D1^2 / (25* D2^2) *2 = 1 ^2 / (25 * 0.05^2) * 2 = 32

13. Po + rho g H+ ½ rho V^2 = P0+ rho g (0) + ½ rho V0^2  V^2 = gH Q = A * V

14. Kx + Fb = mg Solve for x

15. The left object exert force of mg Divided by area A it will give a pressure increase (P1 = mg/A) This pressure increase will be transmitted to the right side (P1 = P2) P2 = kx / (20A) P1 = P2