Most important in an investigation of an airplane crash by the U.S. National Transportation Safety Board is the data stored on the airplane's flight-data recorder, commonly called the "black box" in spite of its orange coloring and reflective tape. The recorder is engineered to withstand a crash with an average deceleration of magnitude $3400 \mathrm{~g}$ during a time interval of $6.50 \mathrm{~ms}$. In such a crash, if the recorder and airplane have zero speed at the end of that time interval, what is their speed at the beginning of the interval?
Added by Andrea W.
Step 1
8 = -33,200 \, \text{m/s}^2$ - Final speed, $v_f = 0 \, \text{m/s}$ - Time interval, $t = 6.5 \times 10^{-3} \, \text{s}$ ** Show more…
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Most important in an investigation of an airplane crash by the U.S. National Transportation Safety Board is the data stored on the airplane's flight-data recorder, commonly called the "black box" in spite of its orange coloring and reflective tape. The recorder is engineered to withstand a crash with an average deceleration of magnitude $3400 g$ during a time interval of $6.50 \mathrm{~ms}$. In such a crash, if the recorder and airplane have zero speed at the end of that time interval, what is their speed at the beginning of the interval?
Airplane flight recorders must be able to survive catastrophic crashes. Therefore, they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing. One of the tests is an impact shock test, in which the box must survive being thrown at high speeds against a barrier. A $41-\mathrm{kg}$ box is thrown at a speed of $220 \mathrm{n}$ $\mathrm{s}$ and is brought to a halt in a collision that lasts for a time of $6.5 \mathrm{~ms}$. What is the magnitude of the average net force that acts on the box during the collision?
Tsunamis are fast-moving waves often generated by underwater earth- quakes. In the deep ocean their amplitude is barely noticeable, but upon reaching shore, they can rise up to the astonishing height of a six-story building. One tsunami, generated off the Aleutian islands in Alaska, had a wavelength of 750 km and traveled a distance of 3700 km in 5.3 h. (a) What was the speed (in m/s) of the wave? For reference, the speed of a 747 jetliner is about 250 m/s. Find the wave’s (b) frequency and (c) period.
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