Answer:
The remaining percentage of drug concentration is about 88.7% 2 years after manufacture.
Explanation:
Recall the formula for the decay of a substance at an initial
concentration at manufacture:
![N(t)=N_0\,e^{-k\,\,t}](https://tex.z-dn.net/?f=N%28t%29%3DN_0%5C%2Ce%5E%7B-k%5C%2C%5C%2Ct%7D)
where k is the decay rate (in our case 0.06/year), and t is the elapsed time in years. Therefore, after 2 years since manufacture we have:
![N=N_0\,e^{-0.06\,\,(2)}\\N=N_0\,e^{-0.12}\\N/N_0=e^{-0.12}\\N/N_0=0.8869](https://tex.z-dn.net/?f=N%3DN_0%5C%2Ce%5E%7B-0.06%5C%2C%5C%2C%282%29%7D%5C%5CN%3DN_0%5C%2Ce%5E%7B-0.12%7D%5C%5CN%2FN_0%3De%5E%7B-0.12%7D%5C%5CN%2FN_0%3D0.8869)
This in percent form is 88.7 %. That is, the remaining percentage of drug concentration is about 88.7% 2 years after manufacture.
Answer:
False, Sunspots appear dark (in visible light) due to their low temperature(cooler) than rest of the sun
Explanation:
Sunspots appear dark because they are much cooler( have low temperature than the rest of the surface contained by Sun. As they appear dark, but still they have very temperature that's why so hot. Sunspots have temperatures ranges 3,500 Celsius (3773 kelvin) and the surrounding surface of the sun has a temperature much higher of about 5,500 Celsius(5773 Kelvin). Even if we see a sunspot alone in space, it will glow so brightly.
Learn more about sunspots :
brainly.com/question/27774496
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Answer:
Explanation:
A ) The spheres are non conducting , charge will not move on the surface so neutralization of charge by + ve and - ve charge is not possible. Charges will remain intact on them . The electric field inside them will be zero . Electric field outside shell will not be spherically symmetrical . Lines of force will emanate from the surface of positively charged shell outwardly oriented and end at negatively charged shell .
B )
distance between the centres of spherical shell
= 2 a
potential energy of charges
= k q₁ x q₂ / R
= k x - Q x Q / ( 2a )
= - k Q²/ 2a
So work needed to separate them to infinity will be equal to
= k Q²/ 2a
The representation of the traffic flow is determined by three main characteristics of this: The flow, the density and the speed. The relationship between the three helps to improve the design of the roads as well as all kinds of facilities operations.
The mathematical relationship that groups them is given by the function:
![q = k*\nu](https://tex.z-dn.net/?f=q%20%3D%20k%2A%5Cnu)
Where,
= Speed
k = Density
q = Flow
Through it it is possible to obtain properties of this by which,
- When the density on the road is zero, the flow is also zero because there are no vehicles on the road
- As the density increases, the flow increases
- When the density reaches a maximum jam density, the flow must be zero because the vehicles will line up from end to end
- The flow will also increase to a maximum value, increases in density beyond that point result in flow reductions.
- Speed is the average speed of space.