4. What is the physics behind a defibrillator and in which lesson/ topic is it an application of?
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- Q4/Find the unknown quantities for the circuits of Figure beside using the information provided. www 2A 69 www 992 www P = 121e-learning.unn.ru/mod/quiz/atte What processes occur in biological tissues when direct current is passed through them? O a. ATP synthesis occurs. O b. The concentration of ions in tissue elements and in cells is kept constant, The breakdown of glucose occurs. ть O C. lons of tissue electrolytes move along the lines of force of the electric field, In tissue elements and in cells, the concentration of ions changes. The equation for the change of position of a material point starting at xo = 0 m is given by x= 0.5at2+bt. The unit of b isSelect the correct statements below: a. The current in a circuit can be measured by using an ammeter. b. The resistance of a resistor can be directly measured by using an ohmmeter. c. The potential difference between any two points in a circuit can be measured by using a voltmeter. d. An ideal ammeter has zero resistance. e. An ideal voltmeter has infinite resistance.
- 1. BRANCHING BLOOD VESSELS Figure 1: A Picture of Blood Capillaries The blood vascular system consists of blood vessels (arteries, arterioles, capillaries, and veins) that convey blood from the heart to the organs and back to the heart. This system should work so as to minimize the energy expended by the heart in pumping the blood. In particular, this energy is reduced when the resistance of the blood is lowered. One of Poiseuille's Laws gives the resistance R of the blood by the following equation: R = C where L is the length of the blood vessel, r is the radius, and C is a positive constant determined by the viscosity of the blood. Figure 2: Vascular Branching Sketch 1 Answer the following questions: (a) Looking at Figure 2, express the total resistance R given by Equation 1 of the blood along the path ABC as a function of the branching angle 0. Meaning that, you need to find the following equation: + CBC| R(0) = C where length |AB| and the length |BC| of the blood vessel are written…8.a. Which of the following statements defines a battery?A. Two plates immersed in an electrolyteB. A group of cells connected in series or parallelC. Several plates immersed in an electrolyteD. A single cell 8.b. A secondary battery is a battery thatA. is supplied with a fuel.B. can only be discharged once.C. can be discharged and recharged.D. has been repaired following damage.a) Find the magnitude of the current through the 20.0 Ω resistor. b) Find the direction of the current through the 15.0 Ω resistor. Circle one. Explain your answer below. The current goes toward the lower right of the circuit OR toward the upper left of the circuit. c) Find the voltage drop across the 10.0 Ω resistor.
- When a switch is closed, two pieces of conducting material A. touch, allowing the electric charges to flow through the circuit.B. touch, preventing the electric charges from flowing through the circuit.C. do not touch, allowing the electric charges to flow through the circuit.D. do not touch, preventing the electric charges from flowing through the circuit.Which of the following is TRUE about drift velocity? A. It refers to the fast movement of electrons after introducing potential difference in a circuit. B. It refers to the amount of current a conductor can hold C. It refers to the gradual movement of the electrons towards to the other terminal after introducing potential difference in a circuit D. It refers to the path the current is taking in a circuitQ2/ Fill the spaces 1- Kinetic energy of mass m whose speed v is 2- is energy transferred to or from an object by means of a force acting on the object. 3- Physics is based on measurement of , 4- A linear resistance has a value of ohms. 5- The of a material is the mass per unit volume.
- 6. Which of the following would have an effect on the resistance of a conducting wire? A. The emf of the battery to which the resistor is connected B. The current passing the through the conductor C. The manner in which it is connected to other resistors D. The material from which the wire is made.What is not a resistor? Check all that apply. a. Something that limits the flow of electrons b. Something that limits the voltage c. Something that robs energy from the system in terms of heat d. Something that produces a voltage drop across it5. Assume that you need to measure an average temperature in a heated space. You have three identical temperature sensors. Each sensor produces a voltage proportional to temperature such that: Sensor Voltage = .01 * Temperature in degrees Celsius Assume that you bave three voltages, Va, V, and V, You want to take the average of these three voltages lin order to compute the average temperature inside the heated space. This circuit has been suggested as a possibility for computing the average. Rf ww Vout A. Find an analytical expression for Vout in terms of the input voltages and the four resistors. B. Determine if a proper dhoice of resistors will let you use this as a averager. If you can, then find some appropriate values for the resistors.