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Suppose you are planning a trip in which a spacecraft is to travel at a constant velocity for exactlyseven months, as measured by a clock on board the spacecraft, and then return home at the same speed. Upon return, the people on earth will have aged exactlyone hundred twenty-five years. According to special relativity, how fast must you travel?
consider a cylindrical nickel wire 1.9 mm in diameter and 3.2 times 104 mm long. calculate its elongation when a load
a car tows a 400kg block up a 45 degree incline. the coefficients of static and kinetic friction are 0.6 and 0.4. the
The school cafeteria has found that they go through 9 sandwiches for every 6 tickets they sell to the students. Today they have 558 sandwiches available. How many lunch tickets can they sell today?
question a soap bubble with walls 398 thick floats in air. if this bubble is illuminated perpendicularly with sunlight
4-in square steel bar subjected to transverse biaxial tensile stressesconsider a 4-in square steel bar subjected to
the parallelogram linkage shown moves in the vertical plane with the uniform 8-kg bar ef attached to the plate at e by
B) Determine the minimum amount of work [kJ ] required to reach this end state. C) If more than the minimum work is actually used, where does this extra energy go? That is what becomes of the extra energy?
air is compressed in a variable-load piston-cylinder device equipped with a paddle wheel. initially air is at 500kpa
the 50-kg flywheel has a radius of gyration about its center of mass of ko 250 mm. it rotates with a constant angular
the uniform work platform which has a mass per unit length of 21 kgm is simply supported by cross rods a and b. the
Why does the definition of NPSH include the dynamic head of the fluid? Isn't cavitation based only on the difference between the static head and the local vapor pressure?
a calculate the number of electrons in a small electrically neutral silver pin that has a mass of 8.0 g. silver has 47
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