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A current of 13.2 A is carried by a copper wire of diameter 1.29 mm. If the density of the conduction electrons is 8.47 1028 m?3, how long does it take for a conduction electron to move 0.55 m along the wire?
The Cosmic Background Radiation Outer space is filled with a sea of photons, created in the early moments of the universe. What is the peak frequency of this radiation
A roller-coaster car moves 177 ft horizontally and then rises 139 ft at an angle of 30° above the horizontal. It then travels 139 ft at an angle of 40° downward. What is its displacement from its starting point? Use graphical techniques.
A helium-neon laser beam has a wavelength of 633 nm in air. What is the wavelength of the light in that liquid
A wire of diameter 0.65mm and length 6.0m stretches 10mm when 5.5kg is hung from it. what is the effective spring constant for the stretching wire
A recording engineer works in a soundproofed room that is 39.4 dB quieter than the outside. what is the intensity outside
A violin string that is 57.8 cm long has a fundamental frequency of 350 Hz. What is the speed of the waves on this string
What is the electrical potential at the surface of a gold nucleus? The radius is 6.6 x 10-15 m and the atomic number Z = 79
A railroad car of mass m moving at v collides completely inelastically with a stationary railroad car of mass 2 m and couples to it
A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110 m. Determine the acceleration of the car
Your teacher tosses a basketball. The ball gets through the hoop (lucky shot). How long does it take the ball to reach the hoop
A stone is projected at a cliff of height h with an initial speed of 40.0m/s, directed 60.0 degrees above the horizontal. find the stone's speed just before impact
What is the electrostatic force on each particle.
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