F = (mass)(acceleration) = ma
m = 55 kg
Vi = 20 m/s
t = 0.5 s
Vf = 0 m/s (since she was put to rest)
a=(Vf-Vi)/t
a=(0-20)/5
a = 40 m/s^2 (decelerating)
F = ma = (55 kg)(40 m/s^2)
F = 2200 N
Hope this answer will be a good h<span>elp for you.</span>
Answer:
The concentration is equal to 1.88x10^-5 M
Explanation:
To calculate the concentration of the unknown solution of 0.699 of absorbance, we must make a graph in Excel and obtain the equation that represents the absorbance vs. molar concentration.
graphing the concentration on the "x" axis and the "y" axis of the absorbance and also linearizing, we have the following expression:
y = 37640x - 0.0089
Clearing x, we have:
x = (y + 0.089)/37640 = (0.699 + 0.089)/37640 = 1.88x10^-5 M
<span>Avogadro's number
represents the number of units in one mole of any substance. This has the value
of 6.022 x 10^23 units / mole. This number can be used to convert the number of
atoms or molecules into number of moles.
1 mol </span>Sr3(PO4)2 ( 1 mol Sr2+ / 1 mol Sr3(PO4)2 ) ( 6.022x10^23 ions Sr2+ / 1 mol Sr2+ ) = 6.022x 10^23 <span>Sr2+ ions</span>
Answer:
Synthetic detergents can be used for washing purposes even when the water is hard, whereas soaps are not suitable for washing with hard water. This is because of the fact that synthetic detergents can lather with hard water. Hence, Synthetic detergents better than soaps.