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A 139 x 10-6 F capacitor is connected to an ac generator with an rms voltage of 39.4 V and a frequency of 86 Hz. What is the rms current in this circuit?
Calculate the cost of electricity using a AA alkaline battery compared to the cost of electricity we use at home
A wheeled car with spring-loaded cannon fires a metal ball vertical. What would happen if the cannon were accelerating
a rubber ball mass 0.27 kg is dropped from a height of 1.8 m onto the floor. just after bouncing from the floor the
the sun is lower in the sky during the winter than it is during the summer.a. how does this change affect the flux of
The equation of a transverse wave traveling along a very long string is y = 7.20 sin(0.0782?x+ 3.62?t), where x and y are expressed in centimeters and t s in seconds. Determine (a) the amplitude, (b) the wavelength, (c) the frequency, (d) the speed
How much energy must the ice absorb if it is to completely melt? If the ice were mixed with 360 grams of water initially at 30°C and the system is assumed to be closed, would the water be able to lose enough energy to melt all the ice? Show calc..
A cosmic ray electron moves at 7.85 multiplied by 106 m/s perpendicular to the earth's magnetic field at an altitude where field strength is 1.10 multiplied by 10-5 T
At what angle ? below the horizontal will the cage hang when the centripetal acceleration is 10 gs? (Hint: The arm supplies centripetal force and supports the weight of the cage. Draw a free body diagram of the forces to see what the angle ? shoul..
In the Bohr theory, principal quantum numbers are denoted by what letter? How did Bohr address the problematic fact that, according to the classical approach, an orbiting electron should emit radiation?
A mother hears a child scream from across the room, 23 feet away. The sound pressure level is 72dB. When she holds the child on her shoulder, her ear is 3 inches from the screams. Using the decibel chart, about how long until damage to her hearing..
Collectible coins are sometimes plated with gold to enhance their beauty and value. Consider a commemorative quarter-dollar advertised for sale at $4.98. Find the cost of the gold added to the coin
A wave pulse travels down a slinky. The mass of the slinky is m = 0.85 kg and is initially stretched to a length L = 6.5 m. What is the speed of the wave pulse
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