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3 years ago

A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher’s head?

2 answers:

5 0

When the bat touches the ball, the kinetic energy from the bat gets transfered and stored in the ball as elastic potential energy. A part of the ball is compressed when the energy is being stored and as per the hooke’s law it uses its potential energy to decompress The decompression results in the ball pushing the surface of bat and the ball bounces away with the potential energy transfering back into kinetic energy.

Elan Coil [88]3 years ago

3 0

The right option is; b. mechanical

Mechanical energy is the best description of the energy of the ball as it flies over the pitcher’s head.

Mechanical energy is the energy that an object acquires due to its position or due to its motion. From the question, the baseball player has chemical potential energy (stored as food) which is transformed into work. As the baseball player hits the ball, there is energy exchange in which the ball acquires energy to perform its work. The energy obtained by the ball upon which work is done is called mechanical energy.

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What mass of ni has as many atoms as there are n atoms in 63.0 g of no2?

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Answer : The mass of Ni is, 80.346 g

Solution :

First we have to calculate the number of moles.

$\text{Moles of }NO_2=\frac{\text{Mass of }NO_2}{\text{Molar mass of }NO_2}=\frac{63g}{46g/mole}=1.369moles$

Now we have to calculate the number of atoms of $NO_2$

As 1 moles $NO_2$ contains $6.022\times 10^{23}$ number of molecules

So, 1.369 moles $NO_2$ contains $1.369\times 6.022\times 10^{23}$ number of molecules

One $NO_2$ molecule has one nitrogen atom then $1.369\times 6.022\times 10^{23}$ number of molecules of $NO_2$ will contain $1.369\times 6.022\times 10^{23}$ number of nitrogen atoms

As per question number of Ni atoms is equal to the number of nitrogen atoms

Number of Ni atoms= $1.369\times 6.022\times 10^{23}$ atoms

Number of moles = $\frac{1.369\times 6.022\times 10^{23}}{6.022\times 10^{23}}=1.369moles$

Mass of Nickel = $Moles\times \text{Molecular mass}}$

Molecular mass of Nickel = 58.69 g/mol

Mass of nickel = $1.369mol\times 58.69g/mol=80.346grams$

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Profundal

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The mass and volume of each box is given in the chart below. Calculate the density of each box. Density = Mass/ volume which box

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Box C will have the greatest density.

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Explanation:

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