2 years ago

The work done by an engine equals one-fourth the energy it absorbs from a reservoir. True or False

Physics

1 answer:

Lunna [17]2 years ago

7 0

True IF the engine is 25% efficient. False otherwise.

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A very powerful vacuum cleaner which has a hose of circular cross section can lift a brick of mass 12 kg when the hose is placed

valkas [14]

Answer:

A). 1.9 cm

Explanation:

m = Mass of brick = 12 kg

g = Acceleration due to gravity = 9.81 m/s²

r = Radius of hose

A = Area = $\pi r^2$

F = Force = $mg$

Let us assume that the pressure required to lift the brick would be atmospheric pressure

$P=\dfrac{F}{A}\\\Rightarrow P=\dfrac{F}{\pi r^2}\\\Rightarrow r=\sqrt{\dfrac{F}{\pi P}}\\\Rightarrow r=\sqrt{\dfrac{12\times 9.81}{\pi\times 101325}}\\\Rightarrow r=0.01923\ m=1.9\ cm$

The radius of the hose should be 1.9 cm

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2 years ago

How do i do this??????????

Sliva [168]

Power = I^2 x R
Energy = Power x Time

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Plutonium has a half life of 2.4 × 104 years. How long does it take for 99.0% of the plutonium to decay?

natali 33 [55]

Answer:

252 years

Explanation:

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Which is NOT one of the four principals of Dalton’s atomic theory?

Gre4nikov [31]

Answer:

Your answer would be letter B. Electrons orbit the nucleus in energy level.

Explanation:

Hope it helps..

Just correct me if I'm wrong, okay?

But ur welcome!!

(;ŏ﹏ŏ)(◕ᴗ◕✿)

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Read 2 more answers

11 A motor is used to lift a load of 40N

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Answer:

The correct answer is option D

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