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garik1379 [7]
3 years ago
13

Using the formula for velocity shown below, what is the average velocity of a bicyclist who biked 20 miles north of where he beg

an for a duration of 4 hours?
Chemistry
1 answer:
Marat540 [252]3 years ago
3 0

8.1km/hr due North

Explanation:

Given parameters:

Displacement = 20 miles North

Time = 4hours

Unknown;

Velocity = ?

Solution:

Velocity is the speed in a particular direction. It is simply displacement divided by time. A change in position with time.

                Velocity = \frac{displacement}{time}

The unit is usually expressed in km/hr or m/s

We need to convert the given displacement to that in km:

              1 mile = 1.609km

             20miles = 1.609 x 20,   32.18km

Velocity  =   \frac{32.18}{4} = 8.1km/hr due North

Learn more:

Velocity brainly.com/question/10962624

#learnwithBrainly

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The average atomic mass of Eu is 151.96 amu. There are only two naturally occurring isotopes of europium, Eu with a mass of 151.
earnstyle [38]

Answer:

The percentage abundance of Eu isotopes are 52 %  and 48 % .

Explanation:

The formula for the calculation of the average atomic mass is:

Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})

Given that:

Since the element has only 2 isotopes, so the let the percentage of first be x and the second is 100 -x.

For first isotope,:

% = x %

Mass = 151.0 amu

For second isotope :

% = 100  - x  

Mass = 153.0 amu

Given, Average Mass = 151.96 amu

Thus,

151.96=\frac{x}{100}\times {151.0}+\frac{100-x}{100}\times {153.0}

Solving for x, we get that:

x = 52 %

<u>Thus percentage abundance of Eu isotopes are 52 %  and 48 % .</u>

7 0
3 years ago
An acetylide anion is more stable than either a vinylic or alkyl anion due to Group of answer choices the greater stability of a
sashaice [31]

Answer:

the stabilization of the negative charge in orbitals with higher s character

Explanation:

Acetylide anion is a carbon anion compound or popularly called carbanion. Now Acetylide anion is sp hybridized. However acetylide anion tends to be more acidic as we move from sp³ to sp, hence acidicity increases, which makes sp to have the highest acidity and become the most  stable.

So, we can conclude that the acetylide anion is more acidic due to the stabilization of the negative charge in orbitals with higher s character and  as the s character increases, acidic nature of acetylide anion also increases.

5 0
2 years ago
At which condition will the entropy of a pure solid be zero?
miss Akunina [59]
The condition at which the entropy of a pure solid will be zero is<span> when a substance is at absolute zero. Absolute zero is </span><span>the lowest temperature that is theoretically possible, at which the motion of particles which constitutes heat would be minimal. It is zero on the Kelvin scale, equivalent to −273.15°C.</span>
5 0
3 years ago
Read 2 more answers
What's the best way to get friends on this website?
krok68 [10]
To help them. Kindly.
5 0
2 years ago
0.035 moles of a compound are found in an erlen meyer flask. Determine its mass molecular weight of the compound if the mass is
Goshia [24]

Answer:

100

Explanation:

M = mass/ number of mole

M = 3.5 g/0.035 mol = 100 g/mol - molar mass

6 0
3 years ago
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