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The cable of the 1900 kg elevator cab shown the figure snaps when the cab is at rest at the first floor, where the cab bottom is a distance d = 4.7 m above a spring of spring constant k = 0.18 MN/m. A safety device clamps the cab against guide rails so that a constant frictional force of 4.0 kN opposes the cab's motion. (Assume that the frictional force on the cab is negligible when the cab is stationary.)
(a) Find the speed of the cab just before it hits the spring.
(b) Find the maximum distance x that the spring is compressed (the frictional force still acts during this compression).
(c) Find the distance that the cab will bounce back up the shaft.
(d) Using conservation of energy, find the approximate total distance that the cab will move before coming to rest.
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at a certain location the earth has a magnetic ?eld of 8.3 times 10-5 t pointing in the northward direction at 44?
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Light of wavelength 5.10 multiply.gif 102 nm passes through a slit of width 0.210 mm. Determine the width of the first-order bright fringe
A proton is accelerated from rest to 0.75c. Find the relativistic momentum of the proton moving at 0.75c.
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