Physics, 14.12.2019 02:31 jabper5522
Let’s think of your cell phone as a rectangular solid of uniform density, with dimensions15 cm by 7 cm by 1 cm. imagine what would happen if you flipped it in the air (wedonotrecommend doing this with a real cell phone.)
(a) describe which axis of the phone has thegreatestmoment of inertia. call thisaxis ˆe3in the body frame of the phone.
(b) you spin the phone exactly around the axis in (a) with angular velocityω3= 20sec−1. what is the resulting motion of the phone (no torques are acting on thephone)?
(c) suppose you are not able to spin the phone exactly around the axis ˆe3, but youalso give it some angular velocityω1ω3around one of the other principal axes. show that the motion is stable, that is, thatω1andω2make small oscillations. what is the frequency of these oscillations, in sec−1? it is these little oscillationsthat make the phone wobble as it rotates through the air.
Answers: 3
Physics, 22.06.2019 06:00, nicollexo21
Using a pedometer, you walk 3000 steps in 20 minutes, so your speed is 150 steps/min. each of your steps is 0.7 m long. what is your speed? 150 steps/min=/s=/h
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Physics, 22.06.2019 11:00, vanvalenpeyt
The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.
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Let’s think of your cell phone as a rectangular solid of uniform density, with dimensions15 cm by 7...
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