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2 years ago

Hot water heater A. Open system B.closed system C. Isolated system

Physics

1 answer:

katrin [286]2 years ago

8 0

To find:

What kind of a system is the water heater?

Explanation:

In an open system, the matter and the energy of the system are exchanged between the system and its surrounding.

In a closed system, only the energy of the system is exchanged with the surroundings and the matter is not exchanged.

In an isolated system, neither energy nor matter is exchanged with the system and the surrounding.

A hot water heater is designed to intake cold water and give hot water as output. That is, the water, a matter, is exchanged between the heater and the surrounding. And the energy in the form of heat is also exchanged between the heater and the surrounding.

Thus the hot water heater is an open system.

Final answer:

The hot water heater is an open system.

Thus the correct answer is option A.

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A magnetic field of 0.080 T is in the y-direction. The velocity of wire segment S has a magnitude of 78 m/s and components of 18

jekas [21]

Answer:

Explanation:

From the information given:

The motional emf can be computed by using the formula:

$E = L^{\to}*(V^\to*\beta^{\to})$

$E = L^{\to}*((x+y+z)*\beta^{\to})$

$E = 0.50*((18\hat i+24 \hat j +72 \hat k )*0.0800)$

$E = 0.50*((18*0.800)\hat k +0j+(72*0.080) \hat -i ))$

$E = 0.50*((18*0.800)$

E = 0.72 volts

According to the question, suppose the wire segment was parallel, there will no be any emf induced since the magnetic field is present along the y-axis.

As such, for any motional emf should be induced, the magnetic field, length, and velocity are required to be perpendicular to one another .

Then the motional emf will be:

$E = 0.50 \hat j *((18*0.800)\hat k -(72*0.080) \hat i ))$

E = 0 (zero)

8 0

3 years ago

Which best describes the meaning of the stayement “if A , then B”

Darya [45]

Answer:

A statement of the form “If A, then B” asserts that if A is true, then B must be true also. If the statement “If A, then B” is true, you can regard it as a promise that whenever the A is true, then B is true also.

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3 years ago

In a physics demonstration, two identical balloons (A and B) are propelled across

viktelen [127]

Okay yeah so umm check I ain’t never

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3 years ago

Calculate the moment of 3kg and 20cm away from the pivot

Oksi-84 [34.3K]

Answer:

5.88 Nm

Explanation:

Applying,

Moment(M) = Force(F)×perpendicular distance(d)

M = F×d.................... Equation 1

But,

F = mg.................. Equation 2

Where m = mass, g = acceleration due to gravity.

Substitute equation 2 into equation 1

M = mgd................. Equation 3

From the question,

Given: m = 3 kg, d = 20 cm = 0.2 m

Constant: g = 9.8 m/s²

Substitute these values into equation 3

M = 3×0.2×9.8

M = 5.88 Nm

4 0

3 years ago

A 0.22 kg mass at the end of a spring oscillates 2.9 times per second with an amplitude of 0.13 m .

andre [41]

Answer:

2.3687599 m/s

0.91106 m/s

0.617213012 J

Explanation:

f = Frequency = $2.9\ Hz$

A = Amplitude = 0.13 m

k = Spring constant

m = Mass of object = 0.22 kg

Angular velocity is given by

$\omega=2\pi f\\\Rightarrow \omega=2\pi 2.9\\\Rightarrow \omega=18.22123\ rad/s$

Velocity is given by

$V=A\omega\\\Rightarrow V=0.13\times 18.22123\\\Rightarrow V=2.3687599\ m/s$

Speed when it passes the equilibrium point is 2.3687599 m/s

Frequency is given by

$f=\dfrac{1}{2\pi}\sqrt{\dfrac{k}{m}}\\\Rightarrow k=m4\pi^2f^2 \\\Rightarrow k=0.22\times 4\pi^2\times 2.9^2\\\Rightarrow k=73.04296\ N/m$

x = Displacement = 0.12 m

In this system the energies are conserved

$\dfrac{1}{2}kA^2=\dfrac{1}{2}mv^2+\dfrac{1}{2}kx^2\\\Rightarrow v=\sqrt{\dfrac{k(A^2-x^2)}{m}}\\\Rightarrow v=\sqrt{\dfrac{73.04296(0.13^2-0.12^2)}{0.22}}\\\Rightarrow v=0.91106\ m/s$

The speed when it is 0.12 m from equilibrium is 0.91106 m/s

The energy in the system is given by

$E=\dfrac{1}{2}kA^2\\\Rightarrow E=\dfrac{1}{2}\times 73.04296\times 0.13^2\\\Rightarrow E=0.617213012\ J$

The total energy of the system is 0.617213012 J

4 0

4 years ago