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The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet. What is the cause of this damping?
During a tennis serve, a racket is given an angular acceleration of magnitude 160 rad/s2. find the magnitude of the total acceleration of the top of the racket
A molecule of HCl (dipole moment p = 3.60×10-30 Cm) and moment of inertia of 2.70×10-47 kgm2) is suddenly subjected to an electric field E at right angles to the direction of the molecule's dipole moment. What is the magnitude of the electric field
Two skiers, one of mass m and the other 2m, start at the top of a mountain. The more daring skier (2m) takes the double black diamond trail to arrive at the bottom more quickly, while the other skier meanders back and forth on a green beginner tra..
A0.430kg pendulum bob passes through the lowest part of its path at a speed of3.80m/s. What is the tension in the pendulum cable at this point if the pendulum is 80.0 cm long
a 0.45 kg mass sliding on a horizontal frictionless surface is attached to one end of a horizontal spring with k 750
A certain laboratory experiment requires an aluminum wire of length of 36.0 m and a resistance of 2.80 ? at 20.0°C. What diameter wire must be used
A playground is on the flat roof of a city school, 4.6 m above the street below (see figure). The vertical wall of the building is h = 6.10 m high, forming a 1.5-m-high railing around the playground. Find the vertical distance by which the ball cle..
You (mass 80 kilogram) and your friend (mass unknown) are in a rowboat (mass 60 kilogram) on a calm lake. Estimate what is your friend mass
While racing a drag race car, Aaron starts the car from rest and accelerates at 4.50 m/s 2 for the entire distance of 126 m. What is in m/s the speed of the car at the end of the run? How long in seconds will it take Aaron to complete the trip?
Two students hold a long wire and rotate it across the earth's magnetic field so that the wire traces a circular path of radius 1.2 m. The motional emf produced in the rope is then measured on a voltmeter. If the angular frequency of rotation is w..
A 600 gram particle (initially at rest at the origin) is subjected to a force of F=15i+20j (N) which pushes the particle along a track with a displacement described by s=3i+4j (m). calculate the average power produced by this force
A straight wire in a magnetic field experiences a force of 0.030 N when the current in the wire is 2.7 A. What is the new current
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