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Lapatulllka [165]

3 years ago

14

Joshua uses his thermometer (experimental value) and finds the boiling point of ethyl alcohol to be 75°C 75 ° C . The accepted v

alue of ethyl alcohol is 80°C 80 ° C . What is his percent error?

1 answer:

QveST [7]3 years ago

8 0

75-80 = 5 = .0625 X 100 = 6.25%

80 80

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On July 8th, I will be 8.51472x10^8 seconds old. How old will I be in years? (Assume 365 days in a year.) Group of answer choice

KatRina [158]

Answer:

26.98

almost 27 years

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3 years ago

Mike Trout of the Los Angeles Angels has a contract worth $426,500,000. If you earn $100,000 per year, how many years would it t

bonufazy [111]

Answer:

The number of years it would take you to earn what Mike Trout will earn on his contract is 4,265

Explanation:

Mike Trout of the Los Angeles Angels has a contract worth $426,500,000

On the other side, you earn $100,000 per year.

To calculate the number of years it would take for you to earn what Mike Trout will earn from his contract, you must divide the amount Mike earned by the amount you earned during a year:

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3 years ago

Solve for x in the following equation?<br><br> v=w/x

Aleonysh [2.5K]

Answer:

x = w/v

General Formulas and Concepts:

<u>Pre-Algebra</u>

Equality Properties

Explanation:

<u>Step 1: Define</u>

v = w/x

<u>Step 2: Solve for </u><em><u>x</u></em>

Multiply <em>x </em>on both sides: xv = w
Divide <em>v</em> on both sides: x = w/v

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3 years ago

A very strong base might have a ph of _____.

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Greater than 7 is considered to have a strong pH base

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4 years ago

Use de Broglie's hypothesis to determine the speed of the electron in a hydrogen atom when in the n = 5 orbit, whose radius is 1

andriy [413]

Answer:

Velocity = 4.41×10⁵ m/s

Explanation:

The force of attraction between the nucleus and the electron is equal to the centrifugal force acting on the outermost electron due to circular rotation. It can be mathematically written as:

$\frac {K\times q^2}{r^2}=\frac {m\times v^2}{r}$

Where,

K is the Coulomb's constant having value 9×10⁹ N. m²/C²

q is the charge on the electron or the proton which is 1.6×10⁻¹⁹ C

r is the radius of the atom

m is the mass of the electron having value 9.1×10⁻³¹ Kg

v is the velocity of the electron.

The equation can be written to calculate the velocity as:

$v=\sqrt {\frac {K\times q^2}{m\times r}}$

Given that:

r = 1.3×10⁻⁹ m

So,

$v=\sqrt {\frac {9\times 10^9\times (1.6\times 10^{-19})^2}{9.1\times 10^{-31}\times 1.3\times 10^{-9}}}$

<u>Velocity = 4.41×10⁵ m/s</u>

4 0

3 years ago