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Two small plastic balls hang from threads of negligible mass. Each ball has a mass of 0.14 g and a charge of magnitude q. The balls are attracted to each other, and the threads attached to the balls make an angle of 20.0 degrees with the vertical. The threads are separated by a distance of 2.05 cm. Find (a) the magnitude of the electric force acting on each ball, (b) the tension in each of the threads, and (c) the magnitude of the charge on the balls.
Two resistors, 66.0 ? and 68.0 ?, are connected in parallel. The current through the second resistor is 3.80 A. Determine the current in the first resistor
A horizontal string tied at both ends is vibrating in its fundamental mode. The traveling waves have speed v, frequency f, amplitude A, and wavelength l.
A 8000-kg car is traveling at 1.7 m/s along a horizontal road when the brakes are applied. How much kinetic energy does the car lose
A large block 19.0 cm wide, 20.0 cm long, and 24.00 cm high of mass 4.55 kg. This block is passing through air (density ?air = 1.43 kg/m3). Calculate the terminal velocity of the block
The figure is taken from a paper (Am J Sports Med 2004 32: 477) on injuries to the anterior cruciate ligament due to forces applied by the patella tendon. What is the horizontal force on the patella tendon
A rocket is fired at 48m/s, in a direction 400 to the horizontal. It explodes in mid air, Find the speed of the rocket just before the explosion
A cube of wood having an edge dimension of 22.0 cm and a density of 650 kg/m3 floats on water. What is the distance from the horizontal top surface of the cube to the water level?
On average, each person in the industrialized world is responsible for the emission of 10 000 kg of carbon dioxide (CO2) every year. how long would each edge of the cube be
A constant force vector F =(8.0i+9.0j+12.0k)N acts on a small object of mass 95 g. What is the angle between F vector and d vector
A constant 80-N force acts on a 5.0 kg box. The box initially is moving at 20 m/s in the direction of the force, Determine both the work done by this force
An astronaut is being tested in a centrifuge. The centrifuge has a radius of 7 m and, in starting, rotates according to ? = 0.30t2, When t = 5.0 s, what is the magnitude of the astronaut's linear speed
A piano tuner stretches a steel piano wire with a tension of 964N . The wire is 0.400m long and has a mass of 3.60g. What is the frequency of its fundamental mode of vibration
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