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Connections to the body for electrocardiography (ECG) and electroencephalography (EEG) are normally made with metal electrodes and conductive gels to ensure good electrical contact. An alternative is the capacitively coupled non contact electrode, which uses a conductor near but not contacting the skin to form a capacitor. Clothing can serve as the capacitor's insulation, eliminating skin contact. A particular EEG instrument calls for capacitive electrodes with maximum reactance 10 M? At a typical EEG beta wave frequency of 25 Hz. What's the minimum electrode capacitance?
A diver of mass 70kg jumps off a board 10m above the water. what average upward force did the water exert on him
A series ac circuit contains a 330ohm resistor, a 13.0mH inductor, a 2.50microF capacitor, Find the average power delivered to the entire circuit
A lightbulb has a resistance of 230? when operating with a potential difference of 180V across it. What is the current in the lightbulb? mA
when a 420 gram mass is attached to a spring it oscillates with a period of 0.350 s. if instead a different mass m2 is
A circuit consists of a 12.0- battery connected to three resistors (40 , 16 and 120 ) in series. Find the current that flows through the battery
The two vectors (3 m)i − (2m)j and (2 m)i +(3m)j − (2 m)k define aplane. It is the plane of the triangle with both tails at onevertex and each head at one of the other vertices. Give a vector that is perpendicular to the plane?
A Carnot heat engine has an efficiency of 0.800.If it operates between a deep lake with a constant temperature of 291.0 K and a hot reservoir, what is the temperature of the hot reservoir
An ideal toroidal solenoid has a cross-sectional area of 0.500 cm^2 , a mean radius of 15.0 cm , and 1600 turns. What is the self-inductance of this solenoid?
When a surfer rides an ocean wave on her surfboard she is actually riding on. a. a crest that is toppling over. b. a trough of the wave. c. The rest position of the wave. d. A region of rarefaction.
A planetary probe is designed to drop the vehicle's instrument package from a height of 20 meters above the planet's surface, Evaluate the acceleration due to gravity at the surface of the planet
q1. a planet of mass 4.00 1025 kg is in a circular orbit of radius 3.00 1011 m around a star. the star exerts a force
A Carnot engine operates with reservoirs at 135°C and 378°C, and 23600 J of heat are transferred into the engine from the hot reservoir during each engine cycle
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