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IrinaVladis [17]
3 years ago
8

A person covers a distance of 320 miles in a travel time of 8 hours. What is the speed for this trip?

Physics
2 answers:
goldfiish [28.3K]3 years ago
8 0
Take 320 and divide by 8
320/8 = 40 mi/hr or A
sasho [114]3 years ago
3 0
It would be A, 40 miles per hour.
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rusak2 [61]

Assuming that the densities of the gases are:

density of air, ρ1 = 1.29 kg / m^3

density of helium, ρ2 = 0.179 kg / m^3

 

Since buoyant force and weight are two forces that are in opposite direction (buoyant force is up while weight is down), therefore equate the two:

buoyant force = weight

m g = (800 + m1) g

where m is the mass of buoyancy, g is gravity and m1 is the maximum mass of the cargo

m = 800 + m1

 

We know that mass is also expressed as:

m = ρ V

where ρ is density of gas and V is volume of the sphere

Since there are two interacting gases here, therefore m is:

m = (ρ1 – ρ2) V

 

Therefore:

(ρ1 – ρ2) V = 800 + m1

(1.29 – 0.179) (4π/3) (8.35m)^3 = 800 + m1

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Answer:

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