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3 years ago

What is a phase change? List 3 examples of a phase change.HELP ASAP :3

Physics

1 answer:

coldgirl [10]3 years ago

3 0

Answer:

1. Solid to liquid：ice cube melting into water.

2. Liquid to gas：water boiling

3. Solid to gas：dry Ice transfer into carbon dioxide directly.

Explanation:

The term phase transition (or phase change) is most commonly used to describe transitions between solid, liquid, and gaseous states of matter, as well as plasma in rare cases.

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A mass of 250 N is on a piston of 2.0 m^2. What force is needed to lift this piston if the area of the second piston is 0.5 m^2?

prohojiy [21]

Answer:

Explanation:

The pressure at one end of the piston is equal to the pressure on the second piston.

Pressure = Force/Area

F1/A1 = F2/A2

Given

F1 = 250N

A1 = 2.0m²

A2 = 0.5m²

F2 = ?

Substituting the given values in the formula;

250/2 = F2/0.5

cross multiply

250*0.5 = 2F2

125 = 2F2

F2 = 125/2

F2 = 62.5N

Hence the force needed to lift this piston if the area of the second piston is 0.5 m^2 is 62.5N

8 0

4 years ago

a dump truck travels 70mph for 3 hours, then for 20mph for another 2 hours in the same direction. what is the average speed the

Dmitry_Shevchenko [17]

Answer:

the average speed of the car is 170 mph.

Explanation:

Given;

initial speed, u = 70 mph

time of motion, t₁ = 3 hours

final speed, v = 20 mph

time of motion, t₂ = 2 hours

The average speed of the car is calculated as;

$v' = \frac{70(3) - 20(2)}{3-2} \\\\v' = 170 \ mph$

Therefore, the average speed of the car is 170 mph.

8 0

3 years ago

HELP DUE TONIGHT

geniusboy [140]

https://www.siyavula.com/read/science/grade-10/sound/10-sound-03

7 0

3 years ago

The chef at a pizza restaurant tosses a spinning disk of pizza dough into the air. As the disk stretches outward in midair and i

kherson [118]

Answer:

* angular momentum throughout the lar process is conserved throughout the entire process

* the angular velocity decreases as the radius of the pizza increases

Explanation:

The system formed by the masses is isolated so its angular momentum is conserved

initial instant, which throws the mass with angular velocity o and radius ro

L₀ = I w₀

final instant. When the mass has a radius r and an angular velocity w

L_f = I_f w

Lo = l_f

I₀ w₀ = I_f w_f

$\frac{ w_f}{w_o } } = \frac{r_o}{r_f}$

let's analyze this result

* angular momentum throughout the lar process is conserved throughout the entire process

* the angular velocity decreases as the radius of the pizza increases

5 0

3 years ago

A square is 1.0 m on a side. Point charges of +4.0 µC are placed in two diagonally opposite corners. In the other two corners ar

Anastasy [175]

Answer:

$V = 1.44\times 10^{5}~V$

Explanation:

The electric potential can be found by using the following formula

$V = \frac{1}{4\pi\epsilon_0}\frac{Q}{r^2}$

Applying this formula to each charge gives the total potential.

$V = V_1 + V_2 + V_3 + V_4\\V = \frac{1}{4\pi\epsilon_0}\frac{4\times 10^{-6}}{(\sqrt{2}/2)^2} + \frac{1}{4\pi\epsilon_0}\frac{4\times 10^{-6}}{(\sqrt{2}/2)^2} + \frac{1}{4\pi\epsilon_0}\frac{3\times 10^{-6}}{(\sqrt{2}/2)^2} - \frac{1}{4\pi\epsilon_0}\frac{3\times 10^{-6}}{(\sqrt{2}/2)^2}\\V = \frac{16\times 10^{-6}}{4\pi\epsilon_0}\\V = 1.44\times 10^{5}~V$

Since the potential is a scalar quantity, it is safe to sum all the potentials straightforward. And since they all placed on the corners of a square, +3 and -3 μC charges cancel out each other.

7 0

3 years ago

What is a phase change? List 3 examples of a phase change.HELP ASAP :3 ​

What is a phase change? List 3 examples of a phase change.HELP ASAP :3