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.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

a cold ice-tea.

pour in room temperature or cold water. cover the pitcher and refrigerate. steep white or green tea for 6 to 8 hours; steep black or oolong tea for 8 to 12 hours.jun 28, 2015

explanation:

wheres the pic