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An aluminum wire having a cross-sectional area equal to 5.30 10-6 m2 carries a current of 7.00 A. The density of aluminum is 2.70 g/cm3. Assume each aluminum atom supplies one conduction electron per atom. Find the drift speed of the electrons in the wire.
In the Bohr model of the hydrogen atom, an electron in the 5th excited state moves at a speed of 8.76 x 104 m/s in a circular path of radius 1.32 x 10-9 m. What is the effective current associated with this orbiting electron?
a 25.0 kg propeller may be considered a 4.5m long rod spun about its center. What final angular velocity does the propeller have if a torque of 1100 Nm is applied for 1.2 sec
When responding to sound, the human eardrum vibrates about its equilibrium position. What is the maximum acceleration of the eardrum
2.2 mol of neon gas is initially at a pressure of 1.8 atm and a temperature of 253oc. i if the gas is cooled at
A galvanometer with a coil resistance of 14.1 is used with a shunt resistor to make a nondigital ammeter that has an equivalent resistance of 0.755. determine the full-scale current of the galvanometer
two point-like particles are placed 33.4 cm apart and are given equal and opposite charge. the first particle of mass
q1. earth takes about 365 days to orbit once around the sun. mercury the innermost planet takes less than a fourth of
Two planes approach each other head-on. Each has a speed of 790km/h , How much time do the pilots have to take evasive action
Suppose a heat engine pulls 3.37×104 J of work from the hot reservoir and 7.52×103 J of that energy is used to perform work. How much energy is rejected by the engine? (This energy is "exhausted" to the cold reservoir.) What is the efficiency of the ..
Ball 1, with a mass of 150 g and traveling at 11 m/s, collides head on with ball 2, which has a mass of 300 g and is initially at rest. What are the final velocities of each ball if the collision is perfectly elastic
A pendulum sweeps out an angle of 12.5° during its motion. How far does the pendulum bob (the ball at the end of the rope) travel
A block of iron at 43.0°C has mass 2.30 kg. If 3.50×104 J of heat are transferred to the block, what is its resulting temperature
A photon having E = 15.2 keV energy scatters from a free electron inside a metal. What is the maximum energy the electron can gain from the photon, At which angle will the electron scatter
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