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A loudspeaker is placed between two observers who are 115 m apart, along the line connecting them. If one observer records a sound level of 51.7 dB and the other records a sound level of 79.3 dB, how far is the speaker from each observer?
A machinist turns the power on to a grinding wheel, at rest, at time t=0 s. What is the angular velocity in the time interval from t=0 to t=25s
A glider of mass 1.00 kg is allowed to oscillate under the influence of a spring of spring constant 25.6 N/m while on a frictionless, horizontal air track. At t = 0 s glider is released from rest at x = 5.00 cm. (At equilibrium, the glider is at x = ..
As a space craft approaches a planet, the rocket engines on it are fired to slow it down so it will go into orbit around the planet. how long must the engines be fired
A spy satellite is in circular orbit around Earth. It makes one revolution in 6.01 hours. How high above Earth's surface is the satellite
Three lamps with resistances 1 ?, 2 ? and 3 ? are connected in series in a circuit with a voltage source of 12V. Calculate the voltage drop across each lamp
Copper has an electrical resistivity %u03C1 = 1.72 x 10-8 %u03A9m. What is the electrical resistance of a copper wire with a radius of 1.0 mm and a length of 25 m
A car is designed to get its energy from a rotating flywheel (solid disk) with a radius of 1.00 m and a mass of 575 kg. estimate the kinetic energy stored in the flywheel
A 18.2-? resistor is made from a coil of copper wire whose total mass is 18.5g. What is the diameter of the wire
A light plane attains an airspeed of 480 km/h. The pilot sets out for a destination 830 km due north but discovers that the plane must be headed 24.0° east of due north to fly there directly
A 35.0-mH inductor has a reactance of 1.80 k. What is the frequency of the ac current that passes through the inductor
the coefficient of static friction is 0.26. If you apply the minimum force needed to get the refrigerator to move, illustrate what will the acceleration then be?
In the figure, suppose that the separation between speakers A and B is 5.90 m and the speakers are vibrating in phase. They are playing identical 110-Hz tones, and the speed of sound is 343 m/s.
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