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- Integrated Concepts (a) Referring to Figure 20.34, find the time systolic pressure lags behind the middle of the QRS complex, (b) Discuss the reasons for the lime lag. Figure 20.34 A lead II ECG with corresponding arterial blood pressure. The QRS complex is created by the depolarization and contraction of the ventricles and is followed shortly by the maximum or systolic blood pressure. See text for further description.A power transmission line is hung from metal towers with glass insulators having a resistance of 1.00109 O. What current flows through the insulator if the voltage is 200 kV? (Some high-voltage lines are DC.)Could a person on intravenous infusion (an IV) be microshock sensitive?
- Apply the junction rule to Junction b shown below. Is any new information gained by applying the junction rule at e?A student in a physics lab mistakenly wired a light bulb, battery, and switch as shown in Figure 21.44. Explain why the bulb is on when the switch is open, and off when the switch is closed. (Do not try this-it is hard on the battery!)Loud thunder claps frequently accompany lightning discharges. Give a description of how scientists believe thunder is produced during a lightning storm.
- Apply the junction rule at point a in Figure 21.52.The speed of propagation of the action potential (an electrical signal) in a nerve cell depends (inversely) on the diameter of the axon (nerve fiber). If the nerve cell connecting the spinal cord to your feet is 1.1 m long, and the nerve impulse speed is 18 m/s, how long does it take for the nerve signal to travel this distance?A 120-V circuit in a house is equipped with a 20-A fuse that will b1ow if the current exceeds 20 A. What is the smallest resistance that can be plugged into the circuit without causing the fuse to blow?
- Name two applications for superconductivity listed in this section and explain how superconductivity is used in the application. Can you think of a use for superconductivity that is not listed?You have been called in as an expert witness in a civil case. The case involves a dispute between neighbors. The plaintiff neighbor is complaining about a buzzing noise during the night that prevents the plaintiff from sleeping. He claims that the buzzing is coming from a light fixture on the defendants porch ceiling. The defendant likes to do installations and repairs himself and has done a sloppy job of installing the light fixture. The fixture hangs vertically from a single wire that is attached through the porch ceiling and down the wall to one connector in a nearby electrical outlet. The second wire is hung horizontally with strings at the level of the light and then runs down the wall to the other connector in the outlet. The defendant leaves the light on all night long for security. Recalling his high school physics, the plaintiff states that the combination of the 60-Hz household voltage and the magnetic field of the Earth results in an oscillating driving force on the single wire from which the light fixture hangs vertically. This, in turn, sets up a standing wave in the wire, and that is the cause of the buzz. You have been hired by the defense attorney. Upon hearing the details of the case, you obtain permission from the defendant and make measurements. The mass of the light fixture is 17.5 kg. The vertical wire from which it hangs is 0.150 m long and has a mass of 0.030 kg. Is the plaintiff correct that the magnetic field of the Earth is causing the buzzing of the wire? Ignore any effect of the second wire.A physics student uses a 115.00-V immersion heater to heat 400.00 grams (almost two cups) of water for herbal tea. During the two minutes it takes the water to heat, the physics student becomes bored and decides to figure our the resistance of the heater. The student starts with the assumption that the water is initially at the temperature of the room Ti=25.00C and reaches Tf=100.00C . The specific heat of the water is c=4180JkgK What is the resistance of the heater?