Search & Filtering
What is the Power of a rechargeable flashlight used by a lookout if it
uses 60,000J for 50min?
A resistor of 50 ohm on inductor of 20/π Hendry and a capacitor of 5 /5 micro farate are connected in a series to a voltage source of 230 volt, 50 hz find the inpedence of the circuit
A point charge (q = +3.5 micro-C) is moved between two points in an electric field. If this requires 7.0 x 10-5 J of work, what is the potential difference between the two points?
Electricity costs $0.10 per kilowatt-hour. How does it cost a family each year if they use 250 kilowatt-hours per month?
Yogi Bear’s class of 18 students used 270 kilowatt-hours of energy last week. What is the per capita energy usage in kilowatt-hours?
A sample of thallium-208 has a half-life of 3.053 minutes. What fraction of the parent material will remain after 12.212 minutes?
a from a balloon reaches the ground in 30 sec. Determine the height of the balloon of it is ascending with a speed of 100cm/s when the bomb is dropped
A 50.0 kg woman, riding on a 10 kg cart, is moving east at 5.0 m/s. The woman jumps off the front of the cart and lands on the ground at 7.0 m/s eastward. What is the final velocity of the cart?
- The circuit shown in Figure 28.5 is constructed using a 6 V battery, a 3 kΩ resistor, and a 6 kΩ resistor. Initially, both switches are open and the capacitor is uncharged.
Switch A is closed and the capacitor begins to charge.
(a) After 1 2 seconds the potential difference across the capacitor is 3.78 V. What is the capacitance of the capacitor?
After several minutes switch A is opened.
(b) What is the approximate potential difference across the capacitor?
Switch B is now closed and the capacitor begins to discharge.
(c) What is the characteristic time for discharging this capacitor?
(d) What will the current through the 6 kΩ resistor be after 2 seconds?
(e) What will the charge on the capacitor be after 3 seconds?
- An 18 µF capacitor has been charged to 100 V. A 15 kΩ resistor and a 5 kΩ resistor, are connected in series with the capacitor.
(a) What is the time constant of this circuit?
(b) Approximately how long (in terms of τ) will it take for the charge stored on the resistor to drop to 0.1% of its original charge?
Once the capacitor is fully discharged the 5 kΩ resistor is removed and replaced with a 12 V battery.
(c) What is the time constant of the circuit now?
(d) Approximately how long will it take for the charge stored on the resistor to rise to 95% of its maximum charge (in terms of τ)?
