# Physics help

**URL:** <https://forum.kirupa.com/t/physics-help/241473>\
**Category:** Uncategorized\
**Created:** [October 14, 2007, 6:08pm UTC](https://forum.kirupa.com/t/physics-help/241473 "2007-10-14T18:08:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lilac722](https://avatars.discourse-cdn.com/v4/letter/l/9d8465/32.png) [@lilac722](https://forum.kirupa.com/u/lilac722)\
**Post date:** [October 14, 2007, 6:08pm UTC](https://forum.kirupa.com/t/physics-help/241473/1 "2007-10-14T18:08:54Z")

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Can someone please help me with this problem?? : (  
Jean, who likes physics experiments, dangles her watch from a thin piece of string while the jetliner she is in takes off from Dulles Airport (Fig. 4-55). She notices that the string makes an angle of [COLOR=#000000]24[/COLOR]° with respect to the vertical while the aircraft accelerates for takeoff, which takes about [COLOR=#000000]18[/COLOR] seconds. Estimate the takeoff speed of the aircraft.  
m/s  
[CENTER] ![](http://www.webassign.net/giancoli5/4_55alt.gif)[/CENTER]