A bird sits on a high-voltage power line with its feet 5.0 cm apart. The wire is made from aluminum, is 2.0 cm in diameter, and carries a current of 190 A. What is the potential difference between the bird's feet? mv
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- In a heart pacemaker, a pulse is delivered to the heart 84 times per minute. The capacitor that controls this pulsing rate discharges through a resistance of 3.9 ✕ 106 Ω. One pulse is delivered every time the fully charged capacitor loses 63.2% of its original charge. What is the capacitance of the capacitor? FChapter 36, Problem 057 Light at wavelength 589 nm from a sodium lamp is incident perpendicularly on a grating with 40200 rulings over width 80 mm. What are the first-order (a) dispersion D and (b) resolving power R, the second-order (c) D and (d) R, and the third-order (e) D and (f) R? (a) Number Units (b) Number Units (c) Number Units (d) Number Units (e) Number Units (f) Number Units3.0 A of electric current pass through a 4.0 Ω resistor. How many electrons pass through the resistor in 5 minutes?
- I_2 is the current travelling through the 2 Ohm resistor. I_4 is the current travelling through the 4 Ohm resistor I_5 is the current travelling through the 5 Ohm resistor A. What is the magnitude of I_2? B. What is the magnitude of I_4? C. What is the magnitude of I_5?A 60W lightbulb in your house is left on for 25 minutes while you do some of your Foundations of Physics homework. A quick google tells you that the mains voltage in Australia is 230V. How many electrons pass through the lightbulb in that time?Your car battery is dead, and your friends are helping you start your car with cheap jumper cables. One cable carries current from their car to your car, and a second cable returns that current to their car. As you try to start your car, a current of 80.0 A flows through the cables to your car and back, and a voltage drop of 6.00 V appears across each cable. If you replace the cheap cables with cables having half their electric resistance, what voltage drop will appear across each new cable if the current doesn't change? AV= i
- The brightness of a lightbulb is dependent on the current that goes through the lightbulb (in reality on the power, which is I^2/R). In Europe, the voltage used is 220 Volts, as opposed to the 120 Volts used in the USA. Will a lighbulb that is made for European voltage work well or poorly in the USA? It will work poorly in the USA. Since I=V/R, if V decreases, so does I, and so does the brightness. It will work more efficiently in the USA. Since I=V/R, if V decreases, I increases, and the brightness increases. It will work better in the USA because the resistance of the wires is smaller. Whether it works better or worse depends on how modern the wiring system is, regardless of the voltage, V.Lightning is a spectacular example of electric current in a natural phenomenon. There is much variability to lightning bolts, but a typical event can transfer 10^9 J of energy across a potential difference of perhaps 5 x 10^7 V during a time interval of about 0.2 s. Use this information to estimate (a) the total amount of charge transferred between cloud and ground (b) the current in the lightning bolt (c) the average power delivered over the 0.2 s.a. An action potential propagates at 64 m/s down an axon that is 30cm long. How much energy is transmitted down the axon if the action potential has a maximum value of 75mV and the resistance is 20,000Ω. b. A 12V battery supplies 0.7mA of current for 4.8hours. How much charge has been transferred? c. The filament in the 100W light bulb has a resistance of 144Ω and is tungsten. It has a diameter of 0.03mm and has a resistivity of 5x10-7Ωm. How long should the filament be?