3 years ago

Describe by using the atomic model as an example, the usefulness of models in science.

1 answer:

7 0

Models help in the visualization and understanding of a phenomenon. For example, the atomic model helped scientists understand the arrangement of protons, neutrons and electrons in the atom long before it could be observed and this helped them relate the structure to its effects.

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A hot-air balloon has a volume of 440 × 10^3 ^3. Calculate the buoyant force that the surrounding cold air exerts on the balloon

siniylev [52]

Answer:

Explanation:

Given that,

The volume of the balloon is

V = 440 × 10³ m³

Buoyant force F?

Given the density of the surrounding to be 2.58 kg/m³

ρ = 2.58 kg/m³

The buoyant force is the weight of water displaced and it is calculated using

F_b = ρVg

Where

F_b is buoyant force

ρ is density

V is the volume of the liquid displace.

g is the acceleration due to gravity

Then,

F_b = ρVg

F_b = 2.58 × 440 × 10³ × 9.81

F_b = 1.1 × 10^7 N

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inessss [21]

Answer: C

Explanation:

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Help Please I Don't Know.

Tom [10]

1)
HCl: hydrogen, chloride
3CO2: carbon, oxygen
2Na2SO4:sodium, sulphur, oxygen.

2)
-HCl: 1 hydrogen atom, 1 chlorine atom
-CO2: 1 carbon atom, 2 oxygen atoms
-Na2SO4: 2 sodium atoms, 1 sulphur atom, 4 oxygen atoms.

3)
-HCl: 2 atoms
-3CO2: 9 atoms
-2Na2SO4: 14 atoms.

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There is not enough information given in the question to determine the velocity.

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