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The Golden Gate Bridge in San Francisco has a main span of length 1.28 km, one of the longest in the world. Imagine that a steel wire with this length and a cross-sectional area of 3.40 10-6 m2 is laid in a straight line on the bridge deck with its ends attached to the towers of the bridge. On a summer day the temperature of the wire is 45.0°C. (a) When winter arrives, the towers stay the same distance apart and the bridge deck keeps the same shape as its expansion joints open. When the temperature drops to ?10°C, what is the tension in the wire? (Take Young's modulus for steel to be 2.00 1011 N/m2, and the average linear expansion coefficient for steel to be 1.1 10-5°C?1.) (b) Permanent deformation occurs if the stress in the steel exceeds its elastic limit of 3.00 108 N/m2. At what temperature would the wire reach its elastic limit?
By what percentage does the density of a bowling ball change (assuming it is a uniform sphere) when it is taken from room temperature (68F ) into the cold night air in Nome, Alaska (-40F ). Assume the ball is made out of a material that has a linear ..
A physics professor demonstrates the Doppler effect by tying a 650 Hz sound generator to a 1.1 m long rope and whirling it around her head in a horizontal circle at 100 rpm.
An airplane flies horizontally with speed 1000km/h(280m/s) an engine falls it takes 30s to gets to the ground. neglect air resistance elucidate the airplane is 4.5km high?.
The average density of the planet Venus is 5219 kg/m3. The acceleration of gravity on its surface is 8.84 m/s2. Calculate the average radius of Venus
A 110-m-wide river flows due east at a uniform speed of 1.5 m/s. A boat with a speed of 8.5 m/s relative to the water leaves the south bank pointed in a direction 39o west of north. find the direction of the boat's velocity relative to the ground
q1. light of wavelength 443 nm in air enters a fishbowl filled with water and then exits through the crown-glass wall
a mixture of na2co3 and baco3 weighing 0.2000 g requires 30.00 ml of 0.1000 n acid for complete neutralization. what is
The ends of two thin glass tubes are stuck in the same pool of water. Although both tubes are thin, one tube has a smaller inside diameter (Tube 1) than the other (Tube 2). Both tubes are made of the same material. Would you expect the level in Tu..
Two wires are tied to the 300g Sphere as shown in figure below. The sphere revolves in a horizontal circle at constant speed of 7.5 m/s. Find the tension in each wire
By what percent must one increase the tension in a guitar string to change speed of waves on the string from 327 m/s to 376 m/s.
Ann is driving down a street at 53km/h. suddenly a child runs into the street. If it takes Ann 0.709s to react and apply the brakes, how far will she have moved before she begins to slow down? Answer in units of m.
Clarify how Einstein's contribution to understanding the force between the earth and the moon differed from Newton's. Include a short statement of Einstein's explanation in the answer.
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