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A small speaker of mass 3 kg is swinging as a simple pendulum on the rope of length 0.9 m while emitting a sound of a single frequency f and power 101 W. When the pendulum is at the end of its swing: 0 radians from vertical position (the furthest away from the equilibrium), the speaker sound is exactly matched by the sound produced by 550-harmonic of the string of length 0.9 m. Given the speed of sound in the air (v=340m/s) Find the maximum and laundess (in dB) of the sound detected by a person 22 meters away from the pendulum suspension point.
Given that the current, natural abundance of U-235 is .72 atom-percent, and neglecting U-234 content of uranium, how long ago was the abundance of U-235 equal to 4 atom-percent?
a long wire lying along the x-axis carries a current of 2.80a in the x direction. there is a uniform magnetic field
a train travels due south at 30 ms relative to the ground in a rain that is blown toward the south by the wind. the
a fisherman notices that wave crests pass the bow of his anchored boat every 4.0 seconds. he measures the distance
A football of mass0.420 kg is thrown 60 m by a quarterback who imparts to it an initial velocity at an angle of 45 degrees above the horizontal. what force does his hand exert on the ball
In the figure below, a nonconducting spherical shell of inner radius a = 1.60 cm and outer radius b = 2.10 cm has (within its thickness) a positive volume charge density ? = A/r, where A is a constant and r is the distance from the center of the s..
The intensity of an electromagnetic wave is 8 × 107 W/m2. What is the amplitude of the magnetic field of this wave
a child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 34.0deg
A 920 kilogram sports car collides into the rear end of a 2300 kilogram SUV stopped at a red light. Estimate the speed of the sports car at impact
Suppose you have a spherical balloon filled with air at room temperature and 1.0 atm pressure; its radius is 10 cm. You take the balloon in an airplane, where the pressure is 0.80 atm. If the temperature is unchanged, what's the balloon's new radius?..
a flat plate solar collector 6 ft by 12 ft is mounted on the roof of a house. the outer surface of the collector is at
What is the angular momentum of a 0.210 kg ball rotating on the endof a thin string in a circle of radius 1.10 m at an angular speedof 10.4 rad/sec^2
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