Transcript CH14.Problems.131.JH

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