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The new Tacoma Narrows Bridge, reopened on October 14, 1950, has the following data:
l= 2800 ft(between towers)
b=60 ft(width between cables)
k=280 ft(maximum sag of cables)
ωt=8570 lb/lineal ft
J0=(wt/g)*P2(rotational mass moment of inertia)
Calculate the new cable tension, the cable torsional stiffness, the new vertical and torsion al vibration frequencies, and compare with previous values. (Assume a reasonable value for the radius of gyration p in determining the torsional mass moment of inertia.)
You (mass 80 kilogram) and your friend (mass unknown) are in a rowboat (mass 60 kilogram) on a calm lake. Estimate what is your friend mass
If a constant force of 416 N acts in the direction opposite to the body's motion, how long must the force act to bring the body to rest
a charge of 9.3 micro-coulombs is placed at the origin of a coordinate system. another charge of -13.6 micro-coulombs
A uniformly accelerated car passes three equally spaced traffic signs. The signs are separated by a distance d = 21 m. obtain the magnitude of the acceleration of the car
an iron wire has a cross-sectional area of 1.01 x 10-5 m2. carry out steps a through e to compute the drift speed of
In the notes I stated that a moving charge will have an electric field. This electric field will produce a magnetic field that is out of phase with the electric field. What is the size of the net force that the positive charge will feel
A figure skater is spinning with an angular velocity of +13 rad/s. She then comes to a stop over a brief period of time. Determine the time during which she comes to rest
A 0.954 kg toy car is powered by four AA batteries (6.00 V total) connected directly to a small DC motor. What is the average current supplied to the car's motor
The system pictured below consists of two blocks of mass m connected via springs to two walls. The springs all have spring constant k. Write the equations of motion for this system. Use as your variables the displacement of each block from its res..
A cat is located 4.7 m in front of a concave mirror. The mirror has a radius of 1.6 m. Construct a ray diagram to scale following the steps outlined in the procedure here. Where is the image of the cat
Calculate the induction generator's total internal current to feed the load specified in given Exercise, separating the self-exciting current to the capacitor and the current to the load itself.
A tower outside the Houses of Parliament in London has a famousclock commonly referred to as Big Ben, the name of its 13-tonchiming bell. What is the torque on the clock mechanism due to the weight of one of the four hourhands when the clock strikes..
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