PHY 205 Midterm: PHY 205 UMiami Fall08 2
Document Summary
Newton"s expression for the gravitation potential energy between two masses m1 and m2. , where r is the distance between the masses and the potential energy is is (cid:1847)(cid:3404)(cid:3398)(cid:1833)(cid:3040)(cid:3117)(cid:3040)(cid:3118)(cid:3045) assumed to be equal to zero at infinity. _______________________________________________________________________: (cid:3495)(cid:2870)(cid:3008)(cid:3014)(cid:3019, (cid:2871)(cid:2870)(cid:1863)(cid:3003)(cid:1846, (cid:3495)(cid:2871)(cid:3038)(cid:3251)(cid:3021)(cid:3040) , although (cid:1874)(cid:3019)(cid:3014)(cid:3020) is smaller than the escape speed, according to maxwell- Boltzmann distribution, there will be molecules with speed bigger than the escape speed and the gas will slowly escape the planet"s atmosphere. A refrigerator uses an ideal gas with constant volume molar heat capacity cv as working substance. The gas is initially at temperature to, volume vo, and pressure po. The gas first expands at constant pressure (isobaric) to twice the volume, then it is compressed adiabatically to the initial volume, finally it returns to the original state through an isochoric process. Write your results only in terms of to, vo, po, and cv. (remember that for a refrigerator. (cid:1847)(cid:3404)(cid:1868)(cid:3042)(cid:1848)(cid:3042)(cid:3030)(cid:3271)(cid:3019) . (cid:1843)(cid:3404)(cid:1868)(cid:3042)(cid:1848)(cid:3042)(cid:4672)(cid:3030)(cid:3271)(cid:3019)(cid:3397)1(cid:4673): 2(cid:3043)(cid:3290)(cid:3023)(cid:3290)(cid:3019) (cid:1855)(cid:3023)(cid:3436)1(cid:3398)2(cid:3267)(cid:3278)(cid:3271)(cid:3440), (cid:3398) (cid:4672)(cid:3278)(cid:3271)(cid:3267)(cid:2878)(cid:2869)(cid:4673) (cid:2869)(cid:2878)(cid:2870)(cid:3278)(cid:3271)(cid:3267)(cid:3437)(cid:2869)(cid:2879)(cid:2870)(cid:3267)(cid:3278)(cid:3271)(cid:3441).
