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1. A flashlight is made by drawing current from a 1.58 A · h, 1.44 V battery through a light emitting diode (LED). The LED draws a current of 36.0 mA.
(a) Determine the power delivered to the LED.
(b) Determine how many hours a fresh battery will power the flashlight.
2. A homemade capacitor is made from a sandwich of a piece of paper (9.0 in. by 15 in., 0.0033 in. thick) between two equal area sheets of aluminum foil.
(a) Calculate the capacitance of this device.
(b) What maximum potential can be put across it?
(c) How much energy can be stored in it at maximum voltage?
A 95.0 kg person stands on a scale in an elevator. What isthe apparent weight in each of the following situations? when the elevator is accelerating upward with an acceleration of1.80 m/s2?
A solenoid has 137 turns of wire uniformly wrapped around anair-filled core, which has a diameter of 6 mm and a length of 8.5cm. The permeability of free space is 1.25664 × 10−6N/A^2 . Calculate the self-inductance of the solenoid.
the index of refraction for violet light in silica flint glass is 1.66 and that for red light is 1.62. what is the
A lightbulb has a resistance of 13? and consumes 9.4W of power; the rod is 1.33m long and moves to the left with a constant speed. what is the speed of the rod
A 35.0-kg child swings in a swing supported by two chains, each 2.92 m long. Find the force exerted by the seat on the child at the lowest point. (Ignore the mass of the seat.)
A 1 mF, a 2 mF, and a 3 mF capacitor are connected in parallel, the combination being connected across a 9 volt battery. Which capacitor has the greatest voltage
What is the total momentum of system after the collision.
The turbines in a jet engine rotate with frequency 16.0 kHz. A) Find the period. Express your answer with the appropriate units. B) Find the angular frequency. Express your answer with the appropriate units.
1. the hydration of co2 is catalyzed by carbonic anhydrase. the data below was collected for this enzyme. determine the
airplane flight recorders must be able to survive catastrophic crashes. therefore they are typically encased in
How many 111 W lightbulbs can you use in a 107 V circuit without tripping a 16 A circuit breaker? (The bulbs are connected in parallel, that means that the potential difference across each lightbulb is 107 V.)
A 20.0 uF capacitor is charged with a 150.0 V power supply, then disconnected from the power and connected in series with 0.280 m Inductor.
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