You can model the population of a certain city between 1955-2000 by the radical function P(x) = 55,000./7-1,945. Using this model, in which year was the population of that city 275,000?

Answer: The ratio of \frac{[Sn^{2+}_{(diluted)}}{[Sn^{2+}_{(concentrated)}]}  in the cell is 4.07\times 10^{-4}

Explanation:

The half reactions for the cell is:  

Oxidation half reaction (anode):  Sn(s)\rightarrow Sn^{2+}+2e^-

Reduction half reaction (cathode):  Sn^{2+}+2e^-\rightarrow Sn(s)

In this case, the cathode and anode both are same. So, E^o_{cell} will be equal to zero.

To calculate cell potential of the cell, we use the equation given by Nernst, which is:

E_{cell}=E^o_{cell}-\frac{0.0592}{n}\log \frac{[Sn^{2+}_{(diluted)}}{[Sn^{2+}_{(concentrated)}]}

where,

n = number of electrons in oxidation-reduction reaction = 2

E_{cell} = 0.10 V

\frac{[Sn^{2+}_{(diluted)}}{[Sn^{2+}_{(concentrated)}]}  = ?

Putting values in above equation, we get:

0.10=0-\frac{0.0592}{2}\log \frac{[Sn^{2+}_{(diluted)}}{[Sn^{2+}_{(concentrated)}]}

\frac{[Sn^{2+}_{(diluted)}}{[Sn^{2+}_{(concentrated)}]}=4.016\times 10^{-4}

Hence, the ratio of \frac{[Sn^{2+}_{(diluted)}}{[Sn^{2+}_{(concentrated)}]}  in the cell is 4.016\times 10^{-4}

The ratio of the Sn2+ concentrations in the two half-cells is 0.00042.

The cell reaction is; Sn(s) ------> Sn^2+(aq) + 2e

Using the Nernst equation;

Ecell = E°cell - 0.0592/n log Q

Ecell = 0.10 V

n = 2

Q = ?

E°cell = 0.00 V

0.10 V = 0.00 V - 0.0592/2 log Q

-(0.10 V × 2/0.0592) = log Q

-3.378 = log Q

Q = 0.00042

Answer:

The i component of F is 7963.2 x 10⁻¹⁹ N.

The j component of F is 4561.2 x 10⁻¹⁹ N.

The k component of F is -151.2 x 10⁻¹⁹ N.

Magnitude of force is 9178.05 x 10⁻¹⁹ N.

Magnitude of force in presence of electric field is 27483.91 x 10⁻¹⁹ N.

Explanation:

Lorentz Force is defined as the force experience by charge particle in presence of electric and magnetic field. It is given by :

F = q ( v x B + E )     .....(1)

Here F is force, v is velocity of particle , B is magnetic field and E is electric field all are in vector notation and q is charge of the particle.

In first case, given :

E = 0

q = 24 x 10⁻¹⁹ C

v = [(-3.68)i + (6.35)j + (-1.91)k] x 105 m/s

B = [(-3.05)i + (5.28)j + (-1.09)k] T

Force, F = q x (v x B )

Substitute the suitable values in the above equation.

F = 24\times10^{-19}\times \left[\begin{array}{ccc}i&j&k\\-3.68&6.35&-1.91\\-3.05&5.28&-1.09\end{array}\right]\times105

F = 24 x 10⁻¹⁹ x { [6.35 x (-1.09) - (-1.91) x (5.28)] i - [(-3.68) x (-1.09) - (-1.91) x (-3.05)] j + [(-3.68) x (5.28) - 6.35 x (-3.05) ] k } x 105

F = 24 x 10⁻¹⁹ x 105 x [(3.16)i + (1.81)j + (-0.06)k] N   ....(2)

The i component of F is 7963.2 x 10⁻¹⁹ N.

The j component of F is 4561.2 x 10⁻¹⁹ N.

The k component of F is -151.2 x 10⁻¹⁹ N.

Magnitude of force, F =\sqrt{(7963.2\times10^{-19}) ^{2} +(4561.2\times10^{-19}) ^{2} +(-151.2\times10^{-19}) ^{2} }

F = 9178.05 x 10⁻¹⁹ N

In this case , E is also present and is equal to [(5.94)i + (-3.97)j + (-5.55)k] x 105 N/C. From equation (1) and (2) ;

F = 24 x 10⁻¹⁹ x [(3.16)i + (1.81)j + (-0.06)k + (5.94)i + (-3.97)j + (-5.55)k] x 105

F = 24 x 10⁻¹⁹ x 105 x [(9.1)i + (-2.16)j + (-5.61)k]

Magnitude of force, F = 24\times10^{-19}\times105\times\sqrt{9.1^{2}+(-2.16^{2})+(-5.61^{2}) }

F = 27483.9 x 10⁻¹⁹ N

Answer:

as being 3 days old

Explanation:

In this specific scenario, the food worker should label the food as being 3 days old. This is because when working in the food industry, the food needs to be labeled with the date of the oldest cooked ingredient. In this case, it would be the chicken.

When foods are unfrozen or cooked, microorganisms begin growing on the foods surface and more enzyme activity begins to take place. This increases the rate at which the food ultimately spoils. Chicken for example is safe to eat, up to 4 days after it has been cooked according to the CDC.

Therefore, the food worker should label the food as being 3 days old to comply with the food industry regulations as well as make sure that the food does not pass its expiry timeframe and is sold. Which can cause someone to become sick.

How the food worker should label the chicken salad

The food worker should label the chicken salad 3 days ago

Labelling of food should be done according to how long the food has been prepared. This is to ensure that food cooked a long time ago is served first before serving food cooked recently.

When cooked food are kept for too long, germs grow on it which causes food poisoning or food wastage.

Answer:

True

Explanation:

Recreational time is the time in which you do your recreation. Recreational activities are often done for enjoyment, amusement, or pleasure and are considered to be "fun". Which means it can come before or after school.

Hope I helped answer the question:)

Recreation encompasses all of the activities that people engage in to refresh their bodies and minds and make their leisure time more interesting and enjoyable. Walking, swimming, meditation, reading, playing games, and dancing are all examples of recreational activities.

True, recreational time can come before or after school.

What are the types of recreational activity?

•  Indoor activities are also included in the recreation program. Indoor recreation activities are carried out in the comfort of one's own home or, more specifically, indoors, and are intended to rejuvenate the mind and soul.
• Outdoor sports, such as the ones mentioned, also provide us with a way to exercise and are thus among the best forms of recreation. Nature walks, river rafting, cycling, camping, fishing, hiking, adventure parks, surfing, and sports are all examples of outdoor recreation sports.

Thus, we can conclude that the given statement is true.