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Two people hear a tornado siren, but one listener is 22.5 times farther away from the source of the sound than the other. What is the intensity level (in dB) at the farther listener relative to the other listener? (dB)
At the same instant that a motionless 9.6 kg ball is dropped from 27 m above the Earth's surface, a second ball, what is the velocity of the center of mass of the two-ball system
A stone is dropped into a river from a bridge 43.90 m above the water. Another stone is thrown vertically down 1.00 after the first is dropped. The stones strike the water at the same time.
The water in a deep underground well is used as the cold reservoir of a Carnot heat pump that maintains the temperature of a house at 294 K. Determine the temperature of the well water
For a Nd:YAG laser there are four pump levels located at 1.00 eV, 1.24 eV, 2.40 eV, and 2.54 eV. What is shortest possible pump wavelength (in nanometers) that could be used to populate any of the excited energy levels
7.84 g of argon gas at an initial pressure of 4.34 atm and at 16°C undergo an isobaric expansion until the volume has increased in five times. What is the volume of the gas after expansion
The microwave radiation left over from the Big Bang explosion of the universe has an average energy density of 3.87 Ã- 10â€"14 J/m3
Assume you are 65.00 cm from a plane mirror. What area of the mirror is used to reflect the rays entering one eye from a point on the tip of your nose if your pupil diameter is 5.0 mm.
An archer puts a 0.33 kg arrow to the bowstring. An average force of 183 N is exerted to draw the string back 1.3 m. suppose that air resistance is negligible.
Two microscopes are placed one on top of the other. They are in contact at one end but a hair separates them at the other end. determine the thickness of the hair?
At the upper atmosphere, the Earth receives approximately 1 KW/m^2 of energy from the sun. If the sun emits energy uniformly into space, what will be the sun's total mass loss
a cylindrical tube oriented vertically on earths surface closed at the bottom and open at the top height 100 m cross
Lisa buys a car for $18,000 with no money down. She pays for the car in 30 equal monthly payments at 12% per annum, compounded monthly. What is her monthly payment, to the nearest dollar
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