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A certain siren radiates sound uniformly in all directions. At a distance of 17m from the siren, the intensity level is 49 db. How many watts of power does the siren put out? The threshold of human hearing is 1.0 x 10^-12 W/m^2
A race car has a mass of 701 kg. It starts from rest and travels 35.0 m in 3.0 s. The car is uniformly accelerated during the entire time. Illustrate what net force is exerted on it?
A chocolate bar (40grams) has 210 Calories. Approximately how long would the 100 watt light bulb shine if we convert all the chocolate's energy into electricity (100% efficiently)? (Remember 1Cal = 1000 cal = 4200 joules)
Think about a communications satellite in geosynchronous orbit. It sits approximately 35,786 kilo meter above the Earth's equator.
Two linear waves have the same amplitude and speed, and otherwise are identical except one has half the wavelength of the other, Which transmits more energy
What is the magnitude of the normal force. What is the total translational kinetic energy of gas molecules.
Two ants race across a table 62.0 cm long. One travels at 4.69 cm/s and other at 3 cm/s. When the first one crosses the finish line, how far behind is second one? Reply in units of cm.
How many centimeters thick would the concrete need to be so that 18.0 per cent of the neutrons are transmitted.
Consider a particle with positive charge q = 8.00 * 10^18 C moves with velocity v=(4i + 2j - k) m/s through a region, calculate the total force on the moving particle
An electron, starting from rest, accelerates through a potential difference of 413 V. What is the final de Broglie wavelength of the electron, assuming that its final speed is much less than the speed of light
A passenger hanging onto a strap notices that an adjacent unused strap makes an angle of 14? to the vertical. What is the radius of the turn
Two rigid rods are oriented parallel to each other and to the ground. The rods carry the same current in the same direction. Determine the current in the rods
Now, as both pipes vibrate at their fundamental frequencies, the beat frequency of 17 Hz is heard. How many centimeters were cut off the end of the second pipe? The speed of sound is 333 m/s.
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