try using my formula....
ar=a(1/2)^2t
therefore, 57(.05) = 57(1/2)^2t
and 57s cancels out, .05 = 1/2^2t
log .05 = log .5^2t
divide log .5 from both sides,
4.32 = 2t
t = 2.16, therefore 126 seconds or 2 minutes and 6 seconds
The answer depends on 3240 WHAT: seconds, days, years?
because
unit sample is defined by $(n)= 1 at n=0; = 0 otherwise; Used for to decompose the arbitrary signal x(n) into summation of weighted and shifted unit samples as follows x(n)=( summation of limit k=- infinite to + infinite) x(k)$(n-k)
parameter !
Select the sample so that it will have the same percentages of people that are men and women as are in the system, and also match the percentage based on educational background and ethnicity
The answer depends on 3240 WHAT: seconds, days, years?
approx. 31 g.
Get a sample analysed at a lab FIRST -so you know what to do .
To determine the percentage of oxygen in FeCr2O4, you would first calculate the molar mass of the compound (iron(II) chromite) using the atomic masses of each element (Fe = 55.85 g/mol, Cr = 51.996 g/mol, O = 16 g/mol). Then, calculate the molar mass percentages of each element within the compound, and finally, determine the percentage of oxygen by mass in the compound.
Heat it over a flame.
Alpha, beta, and gamma radiation were first observed from a sample of Radium in a magnetic field.
1.5% remains after 43.2 seconds.
Cc = (D30)^2 / (D10 * D60) Where: * D60 is the particle-size diameter for which 60 percent of the sample was finer, and, * D30 is the particle-size diameter for which 30 percent of the sample was finer. * D10 is the particle-size diameter for which 10 percent of the sample was finer.
25 people
122.5%
Never!
Approx 28.6 grams.