Recent content by Sloan650

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    Calculating Energy Delivered by a Pacemaker

    all the values i gave were all that was given in the question.
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    Calculating Energy Delivered by a Pacemaker

    2µA - It is current drain due to the pacemaker circuitry. Im a bit confused, its a past exam question.
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    Calculating Energy Delivered by a Pacemaker to the Heart

    Please help?! its for an exam tomorrow!
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    Calculating Energy Delivered by a Pacemaker to the Heart

    A pacemaker stimulates heart tissue with R of 100ohms. Pulse amplitude is 1.2 Volts & pulse duration is 0.5ms. Stimulates at 70bpm Current drain = 2microamps Calculate energy delivered to heart from pacemaker at each pulse. i got P=V^2/R = 0.0144 Then Energy = Power*time =...
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    Calculating Energy Delivered by a Pacemaker

    A pacemaker stimulates heart tissue with R of 100ohms. Pulse amplitude is 1.2 Volts & pulse duration is 0.5ms. Stimulates at 70bpm Current drain = 2microamps Calculate energy delivered to heart from pacemaker at each pulse. i got P=V^2/R = 0.0144 Then Energy = Power*time =...
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    Calculating Peak-to-Peak Amplitude of Out-of-Phase Sine Waves

    Two sine waves have equal peak to peak amplitudes 81 but are out of phase by 90 degrees. What is the peak to peak amplitude of the resultant wave. I have no idea how to start this question, could someone give me guidance?
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    For n1 = 2.15 and n2 = 1.26, what is the critical angle so that all of

    Do I have to multiply out the brackets?
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    For n1 = 2.15 and n2 = 1.26, what is the critical angle so that all of

    Im so confused :( every time i try to rearrange to find n2 i get math error!
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    For n1 = 2.15 and n2 = 1.26, what is the critical angle so that all of

    I have no idea how to rearrange this. i know by squaring both sides the sqaure root will disappear. But on the other side Nmax = 1. How does it rearrange so i get a positive number to square root to find n2?
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    For n1 = 2.15 and n2 = 1.26, what is the critical angle so that all of

    Thank you! I need help rearranging the equation too, I am finding it impossible! Nmax = 4a/lamda x sqaureroot (N1^2 - N2^2) I need to find n2
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    For n1 = 2.15 and n2 = 1.26, what is the critical angle so that all of

    For n1 = 2.15 and n2 = 1.26, what is the critical angle so that all of the incident light, from medium 1 to medium 2 is reflected? Im using Sin ic = n1/n2 For Sin ic i get =1.706 But the reverse Sin of that comes up math error? HELP
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    Phase difference between the two waves

    1) Two sine waves have equal peak to peak amplitudes 89 but are out of phase by 180 degrees. What is the peak to peak amplitude of the resultant wave. 2)Two sine waves have equal peak to peak amplitudes 81 but are out of phase by 90 degrees. What is the peak to peak amplitude of the resultant...