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Suppose that a membrane that has an active Na-K pump with
a current pulse of 10 mA for 6 ms.
(a) Find Vm.
(b) Find the capacitive current.
(c) Calculate the size of the current pulse applied at 6 ms for 1 ms, necessary to raise Vm to 40 mV.
(d) If the threshold voltage is 40 mV and the stimulus is applied as in part (c), then explain whether an action potential occurs.
Assume that the absorption coefficient is 0:1 cm-1, the scattering coefficient of a 5-cm thick tissue is 100 cm-1, the scattering anisotropy is 0.9, and the wavelength of light is 0:5 mm. Calculate the light fluence rate 5 cm from the source.
Construct a table that summarizes the Level 0 information that you have, and information that you might need to obtain. Comment on choices that might need to be reconsidered and why. Comment on what you will do about currently missing information.
Find the value of Ia for which the generator efficiency is a maximum.
What is the armature current corresponding to the maximum torque?
Steam at 100°C is passed into a condenser at a rate of 500 kg/h and leaves as water at 60°C. If the condenser is supplied with cooling water which enters at 20°C and leaves at 40°C, calculate:- how much heat per hour is extracted from the steam.
Algae grown in water containing some 18O (in H2 18O) evolve oxygen gas with the same isotopic composition as the oxygen in the water. When algae growing in water containing only 16O were furnished carbon dioxide containing 18O, no 18O was found to..
Find the components of the convective momentum flux pvv inside and outside the slot - Evaluate the xx-component of pvv.
Are the values of ak from part (c) what you would expect for this signal? Justify your answer clearly. (f) Suppose you wish to model the signal now with p = 3. Write the normal equations for this case.
Three waveforms seen on an oscilloscope are shown in Figure P1.4.7. If the horizontal scale is set to 50 ms per division (500 ms for the entire screen width), and the vertical scale is set to 5 mV per division (±25 mV for the entire screen height ..
The full-load slip is 4%. Determine the percentage reduction in the applied voltage (i.e., the percentage tap on the autotransformer).
A four-pole, lap-wound armature has 144 slots with two coil sides per slot, each coil having two turns. If the flux per pole is 20 mWb and the armature rotates at 720 r/min, calculate the induced voltage, given that the number of parallel paths is..
describe the principles of a vapour adsorption refrigeration system and compare this to a vapour recompression system.
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