Answer:
You answered your own question, I'm confused about what you're asking for.
Answer:
Explanation:
Given that,
Half life = 12years
How long does it take to decompose form 655ppbm to 10ppbm.
Rate of decay is given as
Q=Qo• exp(-λt)
at t=0 Qo=655
Then, Q=10
λ is decay rate and it is
λ= In2 / t½
λ= In2/12
λ=0.05776
Therefore,
Q=Qo• exp(-λt)
10=655exp(-0.05776t)
10/655=exp(-0.05776t)
0.01527=exp(-0.05776t)
Take In of both sides
In(0.01527)=-0.05776t
-4.182=-0.05776t
Then, t=-4.182/-0.05776
t=72.4years
Then the time to decay to 10ppbm is 72 years and 3 months
Or 72 years approximately
Answer:
Explanation:
The formula for the potential energy of a dipole placed in an electric field is given by
U = - pE Cos θ
where, θ is the angle between dipole moment and the electric field vector.
For θ = 0°,
initial potential energy, Ui = - pE
For θ = 180°,
final potential energy, Uf = - pE Cos 180 = pE
Change in potential energy
ΔU = Uf - Ui
ΔU = pE - (-pE)
ΔU = 2pE
Answer:
no they don't hope it helps
Answer:
a) the final velocity is 35.75 ft/s
b) The final elevation is 45 ft
Explanation:
Given the data in the question;
Weight of object; W = 100 lbf
Change in kinetic energy; ΔE = 500 ft-lb
so
m - m = ΔE
m - m = 500
multiply both sides by 2
m - m = 1000
m( - ) = 1000
- = 1000/m
- = (1000)(g) / W
we know that, acceleration due to gravity g = 9.8 m/s² = 32.18 ft/s²
so we substitute
- = (1000)(32.18) / 100
- = (1000)(32.18) / 100
- = 32180 / 100
- = 321.8
since The initial velocity is given to be 40 ft/s;
(40)² - = 321.8
1600 - = 321.8
= 1600 - 321.8
= 1278.2
= √1278.2
= 35.75 ft/s
Therefore, the final velocity is 35.75 ft/s
b)
we know that;
change in potential energy is;
ΔP.E = mg( h - h )
given that; increase in potential energy; ΔP.E = 1500 ft-lbf
and mg = Weight = 100 lbf
we substitute
1500 = 100( h - h )
h - h = 1500 / 100
h - h = 15 ft
given that, elevation of the object; h = 30 ft
h - 30 ft = 15 ft
h = 15 ft + 30 ft
h = 45 ft
Therefore, The final elevation is 45 ft