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1) The intensity level produced by a jet airplane at a certain location is 163 dB. Calculate the intensity of the sound wave generated by the jet at the given location.
2) A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 40 dB by an observer 10 km away.(a) What is the average power generated by the horn? (b) What intensity level of the horn's sound is observed by someone waiting at an intersection 52 m from the train? Treat the horn as a point source and neglect any absorption of sound by the air.
it took a force of 250 N to pull a crate weighing 765 N across the floor. the work done was 3500 J. how far was the crate moved
A force F = ( 2 i + 2 j ) N acts on a particle that undergoes a displacement ?r = (-6 i - j ) m. Find the work done by the force on the particle
In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.0250 s, estimate vertical components of the launch velocity
The density of water is 1000 kg/m3, while that of ice is 916.7 kg/m3. If a block of ice is placed in water, what volume fraction of the ice is below the surface
A loop of 25 turns of wire and radius 15 cm is placed perpendicular to a magnetic field of .4T. what is the average EMF produced across the soil
A light beam containing red and violet wavelengths is incident on a slab of quartz at an angle of incidence of 50.7°. Find the dispersion of the slab
A crane which is effectively fixed to ground lifts a box of mass m with constant speed. The arm of the crane is supported at its base by a friction-free pivot. Determine the tension in the supporting cable
An electron is in the ground state of an infinite square well. The energy of the ground state is E1 = 0.37 eV. What is the width of the square well
A sealed cubical container 11.0 cm on a side contains three times Avogadro's number of molecules at a temperature of 24.0°C
A woman on a rocket traveling at 0.72c (with respect to Earth) observes a meteor come from in front of her and pass her at 0.72c. How fast is the meteor moving with respect to Earth
Two parallel conductive plates of area 0.3m2 hold equal-but-opposite charges of magnitude 30?C on either side. calculate the electric field between the plates
Two protons are moving directly toward one another. When they are very far apart, their initial speeds are 2.00 106 m/s. What is the distance of closest approach
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