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βAn observer that is standing 12m from a stereo sound speaker perceives the sound level from the speaker to be 60 dβ. The decrease in the sound level in part a. is 10 dβ. What is the decrease in the physical intensity in watts/m2?
An engineer in a locomotive sees a car stuck on the track at a railroad crossing in front of the train. When the engineer first sees the car, the locomotive is 130 m from the crossing and its speed is 17 m/s.
Two converging lenses having focal lengths of f1 = 10.5 cm and f2 = 20.0 cm are placed d = 50.0 cm apart. Is the final image upright or inverted
A sodium atom (Z = 11) contains 11 protons in its nucleus. Strictly speaking, the Bohr model does not apply, determine the corresponding radius r of the outermost Bohr orbit
The density of air at standard temperature and pressure (STP) is 1.20 kg/m^3 how much mass could this balloon carry
Light from an argon laser strikes a diffraction grating that has 5345 grooves per centimeter. Determine the wavelength of the laser light
An electromagnetic wave in a vacuum has a magnetic field with a magnitude of 1.4 10-6 T. What is the intensity S of the wave
You have a 1.0m long copper wire. You want to make an N-turn current loop that generates a 1.2mT magnetic field at the center when the current is 2.5A. What will be the diameter of your coil
A soccer player kicks the ball toward a goal that is 23.0 m in front of him. Find the speed of the ball when the goalie catches it in front of the net
A useful model of a water molecule is sketched in the figure below, with point charges of 5.2 10-20 C at the H sites, What is the total electric potential energy of this model of a water molecule
An 91-g arrow is fired from a bow whose string exerts an average force of 100N on the arrow over a distance of 82cm
In reaching her destination, a backpacker walks with an average velocity of 1.19m/s, due west. This avg velocity results bc she hikes for 5.7 km with an avg velocity of 2.18 m/s due west, turns around, and hikes with an avg velocity of 0.511m/s du..
A 110-m-wide river flows due east at a uniform speed of 1.5 m/s. A boat with a speed of 8.5 m/s relative to the water leaves the south bank pointed in a direction 39o west of north. find the direction of the boat's velocity relative to the ground
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