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Liono4ka [1.6K]
3 years ago
12

What is the kinetic energy of the ball precisely 4 seconds after it starts falling?

Chemistry
1 answer:
allochka39001 [22]3 years ago
3 0

it depends how heavy and how far it travels


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calculate the number of coulombs of positive charge in 250cm 3 of (neutral) water. (hint: a hydrogen atom contains one proton; a
Sidana [21]

Number of coulombs of positive charge in 250cm^3 water is 1.3×10^7 C

The volume of 250 cm^3 corresponds to a mass of 250 g since the density of water is 1.0 g/cm^3

This mass corresponds to 250/18 = 14 moles since the molar mass of water is 18. There are ten proton (each with charge q = +e) in each molecule of H_{2}O So,

Q = 14NA  q =14(6.02×10^23)(10)(1.60×10^−19C) = 1.3×10^7 C.

Mass is the quantity of matter in a physical body. It is also a measure of the body's inertia, the resistance to acceleration when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies.

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To calculate the frequency of an electromagnetic wave, you need to know the speed of the wave which you already know as 186000 m
nirvana33 [79]
To finish calculating the frequency of an electromagnetic wave, you need the wavelength
3 0
3 years ago
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Which diagram best represents reciprocal disclosure?
kramer

Answer:I think its B

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3 years ago
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Calculate the density of nitrogen gas, in grams per liter, at stp.
lesantik [10]

Standard temperature is 273 K

Standard pressure is 1 atm

We use the ideal gas equation to find out density of nitrogen gas in g/L

Ideal gas equation:

PV = nRT\\  PV = (\frac{Mass}{Molar mass)}RT\\   P(Molar mass) = (\frac{Mass}{Volume})RT\\  \frac{Mass}{Volume}=\frac{P(molar mass)}{RT} \\  Density = \frac{P(Molar mass)}{RT}

Molar mass of N_{2} = 28 g/mol

Pressure = 1 atm

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Density = \frac{(1atm)(28 g/mol)}{(0.08206 \frac{L.atm}{mol.K})(273 K)}

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Therefore, density of nitrogen gas at STP is 1.25 g/L

4 0
3 years ago
HELP!!!!
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Answer: 908 g Fe2O3

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