Energy is changed from one form to another with no net loss or gain.

Physics

1 answer:

PtichkaEL [24]3 years ago

5 0

Answer:

The correct answer is C) Always true

Explanation:

The law of conservation of energy states that energy cannot be created or destroyed. That implies that the total energy of a isolated system is constant. The energy can change from one form to another with not net loss or gain. For example, in a washing machine, the electrical energy supplied is transformed to mechanical energy which moves the tub. This law constitutes a fundamental principle of thermodynamics and physics, so<u> it is always true.</u>

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How do you balance this equation Mg+ O2= MgO

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Answer:

2 Mg(s) + O2(g) → 2 MgO(s)

As magnesium (Mg) has a valency of +2, and oxygen (O) has a valency of -2, the ratio would be 1:1, and magnesium oxide would be represented as MgO. It is insoluble in water, hence it has the subscript as a solid, represented by (s). In order to use up the diatomic oxygen (O2), there needs to be two moles of magnesium (2Mg) on the reactant side. This would produce 2 moles of MgO on the product side.

Explanation:

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4 years ago

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Answer:

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4 years ago

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Answer:

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Explanation:

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3 years ago

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Two identical wooden barrels are fitted with long pipes extending out their tops. The pipe on the first barrel is 1 foot in diam

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Answer:

To burst the second barrel, the height of water should also be equal to 20 feet

Explanation:

Diameter of the pipe on the first barrel = 1 ft

Diameter of the pipe on the second barrel = 1/2 inch

The pressure of water in the pipes needed to burst the barrel, $P = h \rho g$

To burst the barrel having the larger pipe, water was filled to a height of 20 ft

Note that the pressure of water in the pipes as given by the equation above does not depend on the diameters of the pipe. It only depends on the height, density and acceleration due to gravity. Since the density of water and the acceleration due to gravity are constant, for the second pipe to also attain the same pressure as the first pipe needed to burst the barrel, the height of water in the two pipes must be equal

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Answer:

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Explanation:

The inertia of both disk is the same so

$I_1=I_2$