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An electric eel generates
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Chapter 18 Solutions
COLLEGE PHYSICS,V.2
- A potential difference of 1.00 V is maintained across a 10.0- resistor for a period of 20.0 s. What total charge passes by a point in one of the wires connected to the resistor in this time interval? (a) 200 C (b) 20.0 C (c) 2.00 C (d) 0.005 00 C (e) 0.050 0 Carrow_forwardIf the terminals of a battery with zero internal resistance are connected across two identical resistors in series, the total power delivered by the battery is 8.00 W. If the same battery is connected across the same resistors in parallel, what is the total power delivered by the battery? (a) 16.0 W (b) 32.0 W (c) 2.00 W (d) 4.00 W (e) none of those answersarrow_forwardA 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of 10.0 A. (a) What is the battery’s internal resistance? (b) What power is dissipated inside the battery? (c) At what rate (in °C/min ) will its temperature increase if its mass is 20.0 kg and it has a specific heat of 0.300 kcal/kg • °C, assuming no heat escapes?arrow_forward
- A battery is used to charge a capacitor through a resistor as shown in Figure P27.44. Show that half the energy supplied by the battery appears as internal energy in the resistor and half is stored in the capacitor. Figure P27.44arrow_forwardLightbulb A is marked 25.0 W 120. V, and lightbulb B is marked 100. W 120. V. These labels mean that each lightbulb has its respective power delivered to it when it is connected to a constant 120.-V source. (a) Find the resistance of each lightbulb. (b) During what time interval does 1.00 C pass into lightbulb A? (c) Is this charge different upon its exit versus its entry into the lightbulb? Explain. (d) In what time interval does 1.00 J pass into lightbulb A? (e) By what mechanisms does this energy enter and exit the lightbulb? Explain. (f) Find the cost of running lightbulb A continuously for 30.0 days, assuming the electric company sells its product at 0.110 per kWh.arrow_forwardA student has four identical cells, each of E= 5.0 V and r= 1.0 Ω. How would a student arrange all four cells to get (a) the maximum possible E, (b) the minimum possible E, and (c) an E of 10.0 V? For each case, determine the total internal resistance.arrow_forward
- An electric fish can generate a current with biological cells called electrocytes. The electrocytes are arranged in 100 rows, each row stretching horizontally along the body of the fish containing 5000 electrocytes. The arrangement is suggestively shown below. Each electrocytes has an E.M.F. of 0.15 V and internal resistance of 0.25 Q. 0.15 V 0.25 2 5000 elecrocytes per row 100 rows 500 2 1.48 A 0.012 A 44 A 8.66 Aarrow_forwardIn the figure £₁ = 4.03 V, 2 = 0.838 V, R₁ = 5.400, R₂ = 1.660, R3 = 5.39 Q, and both batteries are ideal. What is the rate at which energy is dissipated in (a) R₁. (b) R2, and (c) R3? What is the power of (d) battery 1 and (e) battery 2? www R₁ R₂ -18₁ R₂ E (a) Number i Units (b) Number i Units (c) Number Units (d) Number i Units (e) Number Units >arrow_forwardR₁ Rs R₁₂ In the figure ε₁ = 3.74 V, 2 = 0.900 V, R₁ = 6.13 2, R2 = 2.35 2, R3 = 4.80 02, and both batteries are ideal. What is the rate at which energy is dissipated in (a) R₁, (b) R2, and (c) R3? What is the power of (d) battery 1 and (e) battery 2? (a) Number Mi Units (b) Number i Units (c) Number i Units (d) Number i Units (e) Number i Unitsarrow_forward
- A potassium ion channel in a cell membrane is filled with intracellular fluid. The potassiumions have charge e. If the channel is open for 2ms, 1.5×104 ions flow through the channel. Thepotential difference across the channel is 70mV. The resistance of the channel equalsarrow_forwardIn biological systems, the change in potential across a membrane or the current through the membrane is rarely due to the motion of isolated electrons. It is instead due to oxidization-reduction reactions that have the effect of moving ions across such boundaries. The sodium-potassium pump, comprised of a sodium-potassium adenosine triphosphatase enzyme, is responsible for the movement of potassium (K+) ions into the cell and sodium (Na+) ions out of the cell. (a) In a time interval of 1.27 x 10-8 s, three sodium ions are pumped out of a cell for every two potassium ions that enter the cell through the membrane. If the exchange of ions continues at this constant rate, what is the net current into or out of the cell (in A)? (Enter the magnitude and direction.) magnitude direction --Select- (b) If a potential difference of 35.0 mV is established across the cell membrane and the transport through the membrane can be approximated as ohmic, what is the resistance of the membrane (in 2)?arrow_forwardA human being can be electrocuted if a current as small as 50 mA passes near the heart. An electrician working with sweaty hands makes good contact with the two conductors he is holding, one in each hand. If his resistance is 2000 , what might the fatal voltage be?arrow_forward
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