# pp13 - PHYSICS: A World View Tuesday, 1 March 2005 READ Ch...

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PHYSICS: A World View Tuesday, 1 March 2005 READ Ch 6 (pp 106-109); Ch 7 (pp 114-118); PS 6: 3 PRAC Ch 6: Q 7, 15; E 5, 11; P 1, 3 HW #13 Ch 6: Q 2, 6, 14; E 8 Th 3 Mar

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Exam #1 0 1 2 3 4 5 6 < 5 0 6 7 8 9 low = 47% average = 77% top = 101%
How many forces act on the satellite? 1 2 3 4 0 0 0 0 1. 0 2. 1 3. 2 4. 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200

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Satellites
Force on a satellite 2 r m GM F E = r mv 2 = 2 E GM v r = ( 29 m 10 4 . 6 kg 10 6 kg 10 67 . 6 6 24 2 11 2 m N × × × = - 2 2 7 /s m 10 3 . 6 × = 8 km/s v

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Kepler’s third law C v T = 2 2 2 2 4 T r v π = E GM r = 2 2 3 4 E T r GM = surface 84.6 min T = 2 r T =
Synchronous satellites  Appear  to  be  stationary  in  the  sky  Must  revolve  west  to  east  once  each   day  Plug    T   = 24 h  into  Kepler’s  third  law   to  get   the  radius.  r   = 6.5  E   = 42,000 km = 26,000 miles     5.5  E   = 22,000 miles  above  the   surface

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Synchronous satellites N S
What is momentum?

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Momentum How hard something is to stop.

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Momentum the mass matters the speed matters p=mv Yes, that’s “p” for momentum!

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hard to stop, small mass m m v v
hard to stop, small velocity M M v v

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MV
P P STOP IT STOP IT! F F t t = = P = P = F F t t

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Impulse What changes the momentum.
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## This document was uploaded on 10/29/2011 for the course PHSX 103 at MSU Bozeman.

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pp13 - PHYSICS: A World View Tuesday, 1 March 2005 READ Ch...

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