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2 years ago

Select the correct answer.

Physics

2 answers:

faust18 [17]2 years ago

3 0

D it’s definitely D if I’m wrong sorry…

Damm [24]2 years ago

3 0

Answer:

Explanation:

Sublimation is when a solid turns into a gas.

A is not sublimation, it is condensation (gas to liquid = water vapor to dew)

B is evaporation (liquid to gas = liquid deodorant to gas)

D is melting (solid to liquid = ice cream to liquid ice cream)

E is condensation (gas to liquid = water vapor to water droplets)

C is the correct answer, because dry ice is a solid and carbon dioxide is a gas, so it is changing from solid to gas.

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The height of the tide measured at a seaside community varies according to the number of hours t after midnight. If the height h

antoniya [11.8K]

Explanation:

Given that, the height of the tide measured at a seaside community varies according to the number of hours t after midnight. The height is given by the equation as :

$h=-\dfrac{1}{2}t^2+6t-9$

When the tide first be at 6 ft, put h = 6 ft in above equation as :

$-\dfrac{1}{2}t^2+6t-9=6$

$-t^2+12t-18=0$

On solving the above equation to find the value of t. It is equal to :

t = 3.551 seconds

t = 8.449 seconds

So, the tide of 6 ft is at 3.551 seconds and 8.449 seconds. Hence, this is the required solution.

6 0

3 years ago

2. A liquid that is twice as dense as water is used in a barometer. With this barometer, atmospheric pressure would push the liq

Scrat [10]

Answer:

The reason why the height for the liquid is 5.18 m is because, for constant pressure, height is inversely proportional to density.

Explanation:

We know that pressure, P = ρgh where ρ = density of material, g = 9.8 m/s and h = height.

Since density of liquid = 2 × density of water = 2 × 1000 kg/m = 2000 kg/m³

Since atmospheric pressure = 101500 N/m²,

The height of liquid for this pressure is h = P/ρg = 101500/(2000 × 9.8) = 5.18 m

For the same pressure, the height for water is h = P/ρg = 101500/(1000 × 9.8) = 10.36 m

Since pressure = constant,

P = ρgh ⇒ P/ρg = h since P and g are constant, h ∝ 1/ρ

ρ₁h₁ = ρ₂h₂

So, the reason why the height for the liquid is 5.18 m is because, for constant pressure, height is inversely proportional to density.

8 0

3 years ago

The transfer of heat by the movement of a fluid is called:

rusak2 [61]

Answer: C

Explanation:

Convective heat transfer, or convection, is the transfer of heat from one place to another by the movement of fluids, a process that is essentially the transfer of heat via mass transfer.

3 0

4 years ago

two skateboarders of mass 50 kg and 60 kg push each other with force 70N.what is the acceleration of each skaters.step by step.

Keith_Richards [23]

Answer:

f=ma

f=70N

m1=50kg

m2= 60kg

a1= f/m

a1= 70/50

a1= 1.4N/kg

a2= 70/60

a2=1.17N/kg

6 0

3 years ago

I’ll mark you as brinlist please help.

Ede4ka [16]

Answer:

245 divided by 5.14=47.6653696 or 47.66

Explanation:

8 0

3 years ago

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