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Three 10.53-g Styrofoam balls of radius 2 cm are coated with carbon black to make them conducting and then are tied to 1.21-m-long threads and suspended freely from a common point. Each ball is given the same charge, q. At equilibrium, the balls form an equilateral triangle with sides of length 24.56 cm in the horizontal plane. Determine the absolute value of q.
A professor walks in a long hall carrying a vibrating 512Hz tuning fork. The end of the hall is closed so that sound reflects from it. The student hears 4 beats per second. How fast is the student walking and in what direction.
An automobile engine slows down from 3000 rpm to 900 rpm in 4.5 s. find the total number of revolutions the engine makes in this time
A cord passes over a weightless and frictionless pulley. Masses of 200 and 300 grams are attached to the ends of the cord. Find the distance the masses will move during the fifth second after they had started.
As part of an excercise program, a woman walks south at a speed of 2.00 m/s for 60 minutes. She then turns around and walks north a distance of 3000 m in 25.0 minutes
A long string with a mass/length of 500 g/m is placed under a tension of 400 N, What is the wavelength of the resulting wave and What is the wave speed
A car (m = 1610 kg) is parked on a road that rises 17° above the horizontal. What are the magnitudes of (a) the normal force and (b) the static frictional force that the ground exerts on the tires?
What is the magnitude of the acceleration of the speck of clay on the edge of a potter's wheel turning at 50 (revolutions per minute) if the wheel's diameter is 38.0 cm.
In a certain RLC circuit, the RMS current is 6.42 A, the RMS voltage is 235 V, and the current leads the voltage by 55.6°. Calculate the average power dissipated in the circuit
What is the total mass of the reagents used in the combustion throughout the 30 days . The ball makes 17 oscillations in 16 seconds. What is it the mass of the ball.
A 15.5kg object moving in the +x direction at 7.0m/s collides head-on with a 11.0kg object moving in the -x direction at 6.0m/s, Find the final velocity of each mass if the objects stick together
Time standards are now based on atomic clocks. A promising second standard is based on pulsars, which are rotating neutron stars (highly compact stars consisting only of neutrons).
A lawn mower is pushed at constant speed by a horizontl force of 10.0 lbs. determine the work done by the person
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