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Three unknown resistors are in a bin; let's call them red, green, and blue. When a Physicist connects the three resistors in series to a 30 volt source she measures 1A of current. When she connects all three in parallel to the same 30V source, she measures 11A of current. If she connects only the red and the green resistors in series to the same source, she gets the same amount of current as when only the blue resistor is connected to the source. If we assume that the blue resistor is 3 times the red resistor in resistance, when she connects just the green resistor in series to a 1 microfarad capacitor, what is the charging time constant?
When an 82.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2 x 10^3 J. By how much does the potential energy of a 17 kg child increase when the child climbs a normal sta..
A 1.6 kg object oscillates with simple harmonic motion on a spring of force constant 400.0 N/m. What is the total energy of the object and the spring
Six mass pieces of 100g each are placed on a mass holder of 140g which is hung from a string. Analyse the tension in the string.
A hydraulic jack is made with a small piston 1.1 cm in diameter that is used to move a large piston 5.3 cm in diameter. how heavy a load can he lift with the jack
The sound level measured in a room by a person watching a movie on a home theater system varies from 60 dB, Approximately how many times louder is the latter sound?
question1what is relative velocity in meters per second between an observer on earth and a galaxy where the h-beta line
Starting from rest, you move with a constant acceleration of 2.1 m/s2 for 13.0 s and then move with an acceleration of -2.1 m/s2 for another 13.0 s. How far do you go during the whole trip
What is the magnitude of the second charge.
A 65.0 kg base runner begins his slide into second base when he is moving at a speed of 4.5 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base.
It is possible to calculate the maximum possible potential (relative to infinity) in air of a metal sphere of 19 cm radius. First, what is the most charge you can put on this sphere.
A person with a mass of 71.6 kg and a volume of 0.089 m3 floats quietly in water. find the volume of the person that is above the water
An object, of mass m = 2 kg, is located between two massless springs on a frictionless incline of 30o . Initially the object is held at a position where the lower spring (k1= 950 N/m), Determine the maximum compression of the upper spring
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