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Question: The sound level 22 m from a loudspeaker is 66 dB. What is the rate at which sound energy is produced by the loudspeaker, assuming it to be an isotropic source?
in W
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how much kinetic energy does each electron have. Blocks of mass m_1 and m_2 are connected by a massless string that passes over the pulley.
What is coefficient of kinetic friction
A toy train engines (2.5Kg) is moving 0.25m/s when it collides with a car (1.6Kg) moving 0.15 m/s in the same direction, Find the speed of the engine-car combination as they move off together
One end of a 68-cm-long copper rod with a diameter of 2.4cm is kept at 480?C, and the other is immersed in water at 24?C. Calculate the heat conduction rate along the rod
Assume a 64 kg boy and a 42 kg girl use a mass less rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3 m/s2, find out the magnitude of the acceleration of the boy toward girl.
A 140 kg piano is being lifted at a steady speed from ground level straight up to an apartment 16.0 m above the ground. The crane that is doing the lifting produces a steady power of 400W. Explain how much time does it take to lift the piano?
question1a 14 g rifle bullet travelling 200 ms buries itself in a 3.5 kg pendulum hanging on a 3.3 m extended string
A skier leaves the ski-jump ramp with velocity of 34.0m/s along the horizontal (0 degree) the ground is vertical distance of 4.20m below the launch potin, How long will it take the skier to touch down
A car with a mass 900kg and velocity 12m/s traveling north isapproaching an intersection. another car with a mass 750kg and avelocity of 9m/s traveling west is approaching the sameintersection.
A satellite of mass 5400kg orbits the Earth and has a period of 6580s, determine the magnitude of the Earth's gravitational force on the satellite
A 16 ohms resistor is in series with an 85-mH inductor and an ac source. Calculate the impedance of the circuit if the source frequency is 75Hz
The deuterium nucleus starts out with a kinetic energy of 1.71e-13 joules, and the proton starts out with a kinetic energy of 3.42e-13 joules. The radius of a proton is 0.9e-15 m; assume that if the particles touch, the distance between their centers..
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