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 3.10 ā 10^ā6 m^2 is laid on the bridge deck with its ends attached to the towers of the bridge, on a summer day when the temperature of the wire is 43.0Ā°c. 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 ā10.0Ā°c, what is the tension in the wire? take young's modulus for steel to be 20.0 ā 10^10 n/m^2. (assume the coefficient of thermal expansion of steel is 11 ā 10ā6 (Ā°c)ā1.)
Answers: 3
Physics, 21.06.2019 15:00
Aparticle moves according to a law of motion s = f(t), 0 ā¤ t ā¤ 12, where t is measured in seconds and s in feet. f(t) = cos(Ļt/6) (a) find the velocity at time t (in ft/s).
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Physics, 21.06.2019 22:50
A110-pound person pulls herself up 4.0 feet. this took her 2.5 seconds. how much power was developed? 0.13 hp 0.32 hp 2.0 hp 3.1 hp
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Physics, 22.06.2019 03:10
Athin plate moves between two parallel, horizontal, stationary flat surfaces at a constant velocity of v = 7.5 m/s. the two stationary surfaces are spaced 4 cm apart, and the medium between them is filled with oil whose viscosity is 0.9 nĀ·s/m2. the part of the plate immersed in oil at any given time is 2 m long and 0.5 m wide. if the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. what would your response be if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top surface (h1)? if the plate moves through the mid-plane between the surfaces, the force required to maintain the motion will be n. if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top (h1) surface, the force required to maintain the motion would be n.
Answers: 2
Physics, 22.06.2019 10:00
Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?
Answers: 2
The golden gate bridge in san francisco has a main span of length 1.28 km, one of the longest in the...
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