Calculating resistance of pacemaker

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Homework Statement


A pacemaker sends a pulse to a patient's heart every time the capacitor in the pacemaker charges toa voltage of 0.25 V. It is desired that the patient receive 75 pulses per minute. Given that the capacitance of the pacemaker is 110 uF and that the battery has a voltage of 9.0 V, what value should the resistance have?


Homework Equations


What value is the resistance?


The Attempt at a Solution

 
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What are the equations involving a charging capacitor?
(hint: its not "what value is the resistance").
 

Thread 'Modeling a graph that shows age in relation to depth of an ice sample'

To solve this, I first used the units to work out that a= m* a/m, i.e. t=z/λ. This would allow you to determine the time duration within an interval section by section and then add this to the previous ones to obtain the age of the respective layer. However, this would require a constant thickness per year for each interval. However, since this is most likely not the case, my next consideration was that the age must be the integral of a 1/λ(z) function, which I cannot model.
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