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Phil finds an old bone at an archeological site and decides to date it. The site is located geographically at a position where the ratio of 14C to 12C in the atmosphere before the year 1900 was about 1.31 · 10-12 . The sample had a ratio if about 3.41 · 10-13. The half-life of 14C is 5730y. How old is this bone?
A 150MW laser pulse is focused with a lens to a diameter of 1.0?m. What is the laser beam's electric field amplitude at the focal point
When two tuning forks of 146Hz and 161Hz, respectively, are sounded simultaneously, how many beats per second are heard.
A child is walking toward a wall at a speed of 1.00m/s in a direction at right angles to the wall. what is the frequency of the whistle
A heater coil connected to a 240 Vrms ac line has a resistance of 34 Ohms. find min values of the instantaneous power
What is the velocity of q_{2} when the balls are 0.450 m apart. what is the speed that the bar falls.
Two elastic particles, each with mass m, collide head on. Initially they have speeds v1 and v2. What are their speeds after the collision
A transformer has 5.00 E4 turns in its primary coil and 7.00 E3 turns in its secondary coil. find the rms current in the primary coil
How far below the top of the well is the surface of the water. If you ignored the travel time for the sound, what would have been the calculated depth.
A convex mirror used in a store has a focal length of -60 cm. A person in the aisle is 2.0 m from the mirror. How far from the mirror is the image
Classical Mechanics: Projectile Motion, A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.80 m/s at an angle of 21.0° below the horizontal. It strikes the ground 3.00 s later.
Water at ground level is moving at a speed of 1.20 m/sec in a pipe at a pressure of 850 kPa. What is the pressure of the water on the fourth floor
A charge of +378 C is fixed at the center of a square that is 0.64 m on a side. How much work is done by the electric force as a charge of +1.8 C is moved from one corner of the square to any other empty corner?
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