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Have you ever listened for an approaching train by kneeling next to a railroad track and putting your ear to the rail? Young's modulus for steel is Y = 2.0 1011 N/m2, and the density of steel is ? = 7860 kg/m3. On a day when the temperature is 30° C, how many times greater is the speed of sound in the rail than in the air? (Treat air as an ideal gas of particles with mass 4.78 10-26 kg and with ? = 1.40.)
Find the final displacement from the starting point. How much greater was the distance she walked than her displacement.
A rock is thrown vertically upward with an initial speed of 100 ft/s. At the same instant another rock is thrown vertically downward from the top of a 280 ft cliff with an initial speed of 40 ft/s. Find the time when the rocks pass each other
If an R = 1.0-k? resistor, a C= 1.0-µF capacitor, and an L = 0.20-H inductor are connected in series with a V = 150 sin (377t) volts source
The electric field between two square metal plates is 130 N/C. The plates are 1.0 m on a side and are separated by 3.0 cm, Calculate the charge on each plate
Incurred expenses of $220,000 for its alcohol rehabilitation program but paid the expenses from unrestricted resources, not from available restricted resources.
In order to pass a physical fitness test, Marcella must run 1000 m at an average speed of 3.90 m/s. How much time does she have to run the last 750 m
An additional magnetic field, horizontal and to the right, of 0.3 T is turned on. What are the magnitude and direction of the torque vector on the loop?In Nm
A softball of mass 0.200kg that is moving with a speed of 7.0m/s collides head-on and elastically with another ball initially at rest, Calculate the mass of the target ball
A roller coaster, traveling with an initial speed of 15 meters per second, decelerates uniformly at -7.0 meters per second2 to a full stop
1.A fight breaks out at club event in Hollywood. As a result, a chair hits a 4.0-m-long metal baron the stage. A microphone at the other end of the bar picks up two pulses of sound (over the roar of the crowd, of course). One of the pulses trav..
If one resistor of a particular size is connected to a battery, 2.5A flow from the battery, How much current flows through one of the 10 resistors
A 2400 kg satellite is in a circular orbit around a planet. The satellite travels with a constant speed of 6.67X10^3 m/s. What is the acceleration of the satellite
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