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A middle-aged people usually have poorer hearing than a middle-aged woman. In one case a woman can just begin to hear a musical tone, while a person can just begin to hear the tone only when its intensity level is increased by 6.9 dB relative to the just-audible intensity level for the woman. Find the ratio of the sound intensity just detected by person to the sound intensity just detected by woman?
a copper cable is designed to carry a current of 260 a with a power loss of 1.70 wm. what is the required radius of
a point charge q is held at a distance of 2a from the center of an isolated and the conducting sphere of radius a. what is the potential of the sphere
question x-rays are scattered from a target at an angle of 15.2deg with the direction of the incident beam. find the
a small glass bead charged to 7.4nc is 4.0cm from a thin uniformly charged 10--cm long glass rod. the bead is repelled
A very small charged block with a mass of 2.35 g is placed on an insulated, frictionless plane inclined at an angle of 17.0° with respect to the horizontal, find the sign and magnitude of the charge on the block
An 800 g ball moves in a vertical circle on a 1.07-m-long string. If the speed at the top is 5-m/s, after that the speed at the bottom would be 8.18 m/s.
A computer to be used in a satellite must be able to withstand accelerations of up to 27 times the acceleration due to gravity. What is the minimum amplitude of vibration that must be used in this test
"Specifically, they must have complementary polarizations. For example, if photon A is later measured to have horizontal (0 degrees) polarization, then the other photon must "collapse" into the complementary state of vertical (90 degrees) polariza..
A long piece of wire with a mass of 0.100 kg and total length of 4.00 m is used to make a suare coil with a side of 0.100 m. Find the torque acting on the coil due to the magnetic force at equilibrium
Within a certain material, an EM wave with lamda=1um is attenuated to 10% of its originality intensity after propagating 10cm. Determine the imaginary part of the index of refraction ni.
A meterstick moving at 0.931c relative to Earth approaches an observer at rest with respect to Earth. What is the meterstick's length, according to the observer
A patients heart pumps 4.2L of blood per minute into the aorta, which has a diameter of 2.2cm. find the average mechanical power output of the heart
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