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A conductor of radius r, length l and resistivity ρ has resistance R. It is melted down and formed into a new conductor, too cylindrical, with one fourth the length of the unique conductor. The resistance of the new conductor is
A particle moving north with a speed of 5600 m/s in a uniform magnetic field pointing upward with a strength of 0.42 T feels a force of 230 N toward the east
In extremely cold weather conditions where the inside thermostat is set to 27 C and the outside temperature is -20 C, your 1200 square ft house might lose heat through the walls at a rate of 4000 W. How much energy might you lose in one week?
air enter a horizontal cylinderical pipe with creoss sectional area of 0.04m2 operating at steady state at 280 k 1 bar
A batter hits a pitched ball when the center of the ball is 1.20 m above the ground. The ball leaves the bat at an angle of 45° with the ground. With that launch, the ball should have a horizontal range (returning to the launch level) of 107 m.
Practical steam engines utilize 475°C steam, which is later exhausted at 300°C. What is the overall efficiency of the two engines
explain at least two key elements for producing ideas that you believe led the american colonists to the boston tea
question a radio wave sent from the surface of the earth reflects from the surface of the moon and returns to the
A resistor with R = 1.5 k? is connected to an AC generator that operates at 60 Hz with an amplitude of 49 V. (a) Find the amplitude of the current through the resistor.
A 20g ball of clay traveling east at 3.0m/s collides, What is the speed of the resulting ball of clay
A 348 g mass is hung on a spring with a spring constant of 25 N/m. Find the stretch of the spring when the mass is in equilibrium
An electron is moving at a speed of 1.2*10^4 m/s in a circular path of radius of 1.9 cm inside a solenoid. Find the strength of the magnetic field inside the solenoid
A wind turbine turns an electrical generator that contains a wire coil with 36 loops and a loop area of 0.10 m2. what is the rms amplitude of the AC voltage produced by the generator
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