Answer:
After 1 second and after 3 seconds.
Explanation:
the amount of medicine in time t is given by A = -40t2 + 160t.
To know the time when the amount of medicine will be 120 micrograms, we need to make the expression A equals 120, and then find the value of t:
120 = -40t2 + 160t
-40t2 + 160t - 120 = 0
dividing everything by -40, we have
t2 - 4t + 3 = 0
we have a second order equation, and to find its roots, we can use the baskhara formula:
D = b2 -4ac = 16 - 12 = 4.
The square root of D is +2 or -2
t_1 = (4 + 2)/2 = 3
t_2 = (4 - 2)/2 = 1
We have two values of t, both acceptable. So, after 1 second and after 3 seconds of the inhalation, there will be 120 micrograms of medicine in the bloodstream.
Hello! The nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine that have created a hole in the ozone layer are the Chlorofluorocarbons (CFCs)
These are compounds developed and improved by Thomas Midgley in the late 1920s. They were used as refrigerants and aerosol propellants.
These compounds created a hole in the ozone layer by the following reactions:
CCl₃F → CCl₂F· + Cl· (In the presence of light. Radical Reaction)
Cl· + O₃ → ClO + O₂
ClO + O₃ → Cl· + O₂
The last 2 reactions can repeat in a radical mechanism and explain why these compounds are so harmful to the ozone layer.
Uniform velocity means no Net force and therefore no acceleration. Acceleration only happens when the velocity changes.
Gamma ray and x Ray I’m pretty sure. Because they have the shortest wavelengths but the highest energy wave. Hope this helped :)