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At a rock concert, a meter reads 130 dB when located 2.80 meter in front of a loudspeaker. Find what was the sound power output of the speaker assuming uniform, isotropic sound propagation?
How much is the spring compressed?
Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 3.0 s, it rotates 30 rad. What was the average angular velocity? What was the angular acceleration through this time?
A particle with negative charge and mass = 2.50×10?15 is traveling through a region containing a uniform magnetic field. Determine the cyclotron frequency of the particle
A 25 kg suitcase is being pulled with constant speed by a handle that is at an angle of 22 degrees above the horizontal. what is the force F applied to the handle
Three successive resonance frequencies for a certain string are 481., 518., and 555. Hz. What is the fundamental frequency
A cylinder contains a mixture of helium and argon gas in equilibrium at a temperature of 208 C. What is the average kinetic energy of each type of molecule
X-ray pulses from Cygnus X-1,a celestial x- ray source, have been recorded during high- altituderocket flights. The signals can be interpreted as originating whena blob of ion- ized matter orbits a black hole with a period of5.25 ms. I
the temperature of your skin is approximately 36oc.what is the wavelength at which the peak occurs in the radiation
A 99 kg man lying on a surface of negligible friction shoves a 71 g stone away from himself, giving it a speed of 4.0 m/s. What speed does the man need as a result.
The resistance of a 100-cm wire of cross sectional area 2 × 10-6 m2 is 400 ?. What is the resistivity of the material of this wire
A 3.00*10^2-eV electron and a 1.00*10^2-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?
Two trains, each having a speed of 30 km/h are headed at each other on the same straight track. A bird can fly 60km/h flies off the front of one train when they are 60 km apart and heads directly back to the first trains and so forth, what's the tota..
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