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A) Steel train rails are laid in 12.2 m -long segments placed end to end. The rails are laid on a winter day when their temperature is-2.00degrees C. How much space must be left between adjacent rails if they are just to touch on a summer day when their temperature is 33.0 degrees C ?
d = _____ mm
B) If the rails are mistakenly laid in contact with each other, what is the stress in them on a summer day when their temperature is 33.0 degrees C ?
= _____ Pa
A penny sits on a rotating disk that rotates once every 0.9 s. The coefficients of static and kinetic friction between the penny and disk are 0.58 and 0.48, respectively. For the penny to not slide, what is its largest distance from the center of the..
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