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olchik [2.2K]
3 years ago
10

A stone is dropped from the upper observation deck of a tower, "500" m above the ground. (Assume g = 9.8 m/s2.) (a) Find the dis

tance (in meters) of the stone above ground level at time t. h(t) = Correct: Your answer is correct.
Physics
1 answer:
Yuri [45]3 years ago
4 0

Answer:

h₍₁₎ = 495,1 meters

h₍₂₎ = 480,4 m

h₍₃₎ = 455,9 m

...

..

Explanation:

The exercise is "free fall". t = \sqrt{\frac{2h}{g} }

Solving with this formula you find the time it takes for the stone to reach the ground (T) = 102,04 s

The heights (h) according to his time (t) are found according to the formula:

h(t) = 500 - 1/2 * g * t²

Remplacing "t" with the desired time.

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Describe the relationship between the forces of attraction and the kinetic energy of particles in a solid, a liquid and a gas
mel-nik [20]

Answer:

Described below

Explanation:

1) Solids: In solids, the strong attractive forces between the particles ensure that the particles are packed tightly enough and this means little or no movement between each other. However, when they experience vibration which has relationship with the kinetic energy between them

2) Liquids; In liquids due to the lesser forces of attraction between the particles, it means they tend to glide over each another but however, toward the bottom of the container they will settle. This means that the attractive forces between the liquid particles are barely strong enough to hold onto a specific volume. However, they are not strong enough to keep the molecules from sliding over one other.

3) Gases; In gases, there is almost no existing attractive force in most cases and as a result we can say the kinetic energy of the gas molecules is always greater than the attractive force between them and they are therefore far apart from each other and also move independent of each other.

5 0
3 years ago
An aluminum rod of length 3.3 m and crosssectional area 3.8 cm2 is inserted vertically into a thermally insulated vessel contain
Sveta_85 [38]

Answer:

V_vap = 161.2 L

Explanation:

The total mass of the aluminum rod is given as;

m = ρ∙V = ρ∙L∙A

Where;

ρ is density = 2700 kg/m³

L is length = 3.3m

A is cross sectional area = 3.8 cm² = 3.8 x 10⁻⁴ m²

Thus;

m = 2700kg/m³•3.3m•3.8 × 10⁻⁴m²

= 3.3858kg

By cooling down the submerged half of the aluminum rod releases an heat amount of

Q = (1/2)∙m∙cp∙∆T

Where;

cp is specific heat of aluminum aluminum = 900 J/kg

∆T is change in temperature = 274 - 4.2 = 269.8 K

Thus;

Q = (1/2)•3.3858•900•(269.8)

= 411069.978 J

The liquid absorbs this heat and vaporizes partially, such that the heat equals vaporized mass times latent heat of vaporization:

Q = m_vap•∆h_vap

Making m_vap the subject;

m_vap∙ = Q/∆h_vap

Where ∆h_vap is latent heat of vaporization given as 20900J/kg

Thus,

m_vap∙ = 411069.978/20900

= 19.668 kg

Let's divide this mass by the density of liquid helium and we get the liquid volume which has vaporized:

V_vap∙= m_vap/ρ

V_vap∙ = 19.668/122

V_vap∙ = 0.1612 m³

Converting to litres;

V_vap = 0.1612 x 1000

V_vap = 161.2 L

3 0
3 years ago
Due to human demand because of its importance to life, the Earth's most precious resource is 
pychu [463]
The answer is variant C because every living organism needs water to survive. A human can live without water only 6 days, after that period the most important organs start to shut down because of the lack of water.
3 0
2 years ago
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you push a ball to star it rolling along a "perfectly frictionless" surface. How far will the ball roll
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Technically, it should roll forever.
6 0
3 years ago
If a 60-g object has a volume of 30 cm", what is its density?
alisha [4.7K]

Answer:

Density = Mass/volume. D= 60/30.Divide it and you'll get ur answer as 2

5 0
3 years ago
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