CH14.Problems

JH.131

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

A1 V1 = A2 V2

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

Po + rho g H+ ½ rho V^2 = P0+ rho g (0) + ½ rho V0^2 V^2 = gH

Q = A * V

Kx + Fb = mg

Solve for x

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