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A high-tension power line composed of aluminum wire with cross-section area 24 x10?6 m2 carries a current of 1100 A. The bulk resistivity of aluminum is 2.82 x10?8. What is the power loss over 50 km of wire?
A 52 {rm kg} ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.50 turns each second. The distance from one hand to the other is 1.5 {rm m}. Biometric measurements indicate that each hand typi..
At one instant a bicyclist is 35.0m due east of a park's flagpole, going due south with a speed of 20 m/s. Then, 19 s later, the cyclist is 60.0 m due north of the flagpole, going due east with the speed of 11 m/s. For the cyclist in this 19s inte..
A lead ball is dropped into a lake from a diving board 5 above the water. After entering the water, it sinks to the bottom with the constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 3.20 after it is f..
The dipole is held perpendicular to a uniform electric field with field strength 980V/m , then released. What is the dipole's angular velocity at the instant it is aligned with the electric field?
A single circular loop piece of copper wire has a radius (r) of 12 cm. What is the average electrical energy dissipated in the resistance of the wire
An isolated conductor of arbitrary shape has a net charge of +1.2 10-5 C. What is the charge on the cavity wall
A 1.9 kg object that stretches a spring 8.8 cm from its natural length when hanging at rest oscillates with an amplitude of 6.5 cm, Find the total energy of the system
A rms AC voltage of 118 V at 60 Hz is applied to an RLC circuit with 11.8 mH inductor, 0.171 µF capacitor, and 43.1 ? resistor in series. What is the power factor of the circuit
A common flea that has a mass of 0.008 g can jump vertically as high as 19 cm. Estimate the wavelength for the flea immediately after takeoff
A person can just see this bulb from a distance of 800m, with the pupil diameter dialated to 7.5mm, how many photons per second are entering the pupil
Saturn's moon Titan is the largest moon in the solar system. Its mostly-nitrogen atmosphere exerts a pressure of 1.60×105 Pa at the moon's surface.
right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out
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