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2 years ago

________ energy is the energy of the motion or vibration of molecules in a substance.

2 answers:

7 0

<span>Heat energy is the energy of the motion or vibration of molecules in a substance. The answer is letter A. A wrecking ball on its way down before it hits a building is an example of kinetic energy being converted into mechanical energy. The answer is letter D.</span>

tamaranim1 [39]2 years ago

4 0

The answer to the first question is A. Heat, because in order to heat up or catch fire, the molecules have to vibrate quickly.

This wrecking ball is an example of potential energy being converted into kinetic energy, so your answer is B. potential, kinetic.

Source: I have had to answer both questions before.

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The difference between a need and a want gets blurry for some people because of:

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The answer should be all of the above

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2 years ago

The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water (H2O) and O2 gas. Which co

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D. 2 in front of water and 1 in front of oxygen

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2 years ago

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Fiesta28 [93]

Answer:

Earthquakes

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3 years ago

If an object with a density 0.25 g/mL has a mass of 10 grams, and is added to a graduated cylinder filled with 50 mL of water, h

kramer

Answer : The correct option is, (d) 90 mL

Explanation :

First we have to calculate the volume of an object.

As we know that,

$Density=\frac{Mass}{Volume}$

Given:

Density of an object = 0.25 g/mL

Mass of an object = 10 g

Now put all the given values in the above formula, we get:

$0.25g/mL=\frac{10g}{Volume}$

$Volume=40mL$

Thus, the volume of an object is 40 mL.

Now we have to calculate the height of the water in the graduated cylinder rise.

As we are given that:

The volume of water in graduated cylinder = 50 mL

The volume of an object = 40 mL

The height of the water in the graduated cylinder rise = Volume of water in graduated cylinder + Volume of an object

The height of the water in the graduated cylinder rise = 50 mL + 40 mL

The height of the water in the graduated cylinder rise = 90 mL

Therefore, the height of the water in the graduated cylinder rise will be, 90 mL

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3 years ago

A skier traveling 11.0 m/s reaches the foot of a steady upward 17 â incline and glides 15 m up along this slope before coming to

Darina [25.2K]

The attached free-body diagram shows the forces that are responsible for the skier coming to rest eventually on the incline.

We see that the component of his Weight along the incline $mgSin \alpha$ and the Friction both act in tandem to stop him.

In order to calculate the Friction, we can make use of Newton's 2nd law, which states that $F_{net} = ma$

The $F_{net}$ here is given by $mgSin \alpha + F_{k}$ , where $F_{k}$ is the Kinetic Friction.

We also know that the magnitude of Friction Force can be calculated using the equation $F_{k} =$ μ. $F_{N}$ , where $F_{N}$ is the Normal Force acting perpendicular to the incline as shown in the figure.