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A battery is connected in series with a R = 0.31 ? resistor and an inductor, as shown in the figure below. The switch is closed at t = 0. The time constant of the circuit is ? = 0.20 s, and the maximum current in the circuit is I = 7.9 A. Find the following. (a) the emf of the battery V (b) the inductance of the circuit mH (c) the current in the circuit after one time constant has elapsed A (d) the voltage across the resistor and the voltage across the inductor after one time constant has elapsed resistor V inductor V
Starting from rest, a 2.3x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, What is the flea's speed when it leaves the ground
A triply ionized beryllium ion, Be^3+ (a beryllium atom with three electrons removed), behaves very much like a hydrogen atom, What is the ground-level energy of the beryllium
A toroid of mean radius 27 cm and circular cross section of radius 1.7 cm is wound with a superconducting wire of length 1000 m that carries a current of 350 A. What is the magnetic field at the mean radius
the hanging object has a mass of m1 = 0.370 kg; the sliding block has a mass of m2 = 0.780 kg; and the pulley is a hollow cylinder with a mass of M = 0.350 kg, Find the angular speed of the pulley at the same moment
A force applied to an object of mass m1 produces an acceleration of 3.90 m/s2. The same force applied to a second object of mass m2 produces an acceleration of 2.00 m/s2. (a) What is the value of the ratio m1/m2? (b) If m1 and m2 are combined into on..
A car moves horizontally with a constant acceleration of 3 m/s2. A ball is suspended by a string from the ceiling of the car; What angle does the string make with the vertical
A converging lens with a focal length of 31 cm is used to form an image on a screen that is 2.7 m to the right the lens. Where must the object be placed
A cart with mass 320 g moving on a frictionless linear air track at an initial speed of 1.9 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. What is the speed of the two-cart center of mass
An iron boiler of mass 222 kg contains 860 kg of water at 20°C. A heater supplies energy at the rate of 52900 kJ/h. How long does it take for the water to reach the boiling point
In a pool game, the cue ball, which has an initial speed of 5.0 m/s, make an elastic collision with the eight ball, which is initially at rest. Find the direction of motion of the cue ball after the collision
An unpolarized light beam of intensity I = 14.0 W/m2 is directed along the x-axis and enters a sequence of three polarizers at normal incidence. Calculate the intensity of the light leaving the last polarizer
question1a rocket with mass m is fired vertically upward. at an instant it reaches an altitude of 800m and a speed of
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