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tekilochka [14]
2 years ago
11

In a practical machine, the power output is smaller than the power input. Considering the law of energy conservation, what can e

xplain this occurrence?
A. Some of the energy is used to combat friction, and thus is transformed from mechanical energy to heat.

B. Some of the energy going into the machine is being created at a quicker rate than the energy coming out is being destroyed.

C. Some of the energy coming out of the machine is being destroyed.

D. Some of the energy going into the machine is being destroyed
Physics
2 answers:
TEA [102]2 years ago
7 0

PF STUDENTS:  Some of the energy is used to combat friction, and thus is transformed from mechanical energy to heat.

Grace [21]2 years ago
5 0

The law of energy conservation states that energy cannot be created or destroyed, so choices B to D are immediately invalid. Choice A can explain this occurrence: <u>A. Some of the energy is used to combat friction, and thus is transformed from mechanical energy to heat.</u>

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Answer: final Velocity v = 10.2m/s

Explanation:

Final speed v(t) is given as

v(t) = u + at .......1

Where; u = the initial speed

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Given

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a = g = 10m/s2 (acceleration due to gravity)

Substituting into the equation above we have

5 = 2t + 5t^2

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Applying the quadratic formula. We have;

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3 years ago
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a steel sphere and brass ring have diameter 25cm and 24.9cm at 15°C.If the sphere and the ring are heated together.what is the t
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Answer:

Explanation:

Due to heat energy , metal expands . Formula for linear expansion is as follows .

L = l ( 1 + α Δt )

where L is expanded length , l is original length , α is coefficient of linear expansion and Δt is increase in temperature .

To pass the sphere through the ring , the diameter of both ring and sphere should be same after heating . Let after increase of temperature Δt , their diameter becomes same as L  . The linear coefficient of brass and steel are

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For steel sphere ,

L = 25 ( 1 + 12 x 10⁻⁶ Δt )

For brass ring

L = 24.9 ( 1 + 20 x 10⁻⁶ Δt )

25 ( 1 + 12 x 10⁻⁶ Δt ) = 24.9 ( 1 + 20 x 10⁻⁶ Δt )

1.004( 1 + 12 x 10⁻⁶ Δt ) =  ( 1 + 20 x 10⁻⁶ Δt )

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Newtons first law 1 to 5. <br>What is each of the net force for all of the 5 questions? ​
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Answer:

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Force 1 applied to the left (F₁) = 35 N

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Force applied to the right (Fᵣ) = 75 N

Force applied to the left (Fₗ) = 75 N

Net force (Fₙ) =?

Fₙ = Fₗ – Fᵣ

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