Physics 1 Problem Solutions 129

# Physics 1 Problem Solutions 129 - Chapt 14 Gravity 125 014...

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Unformatted text preview: Chapt. 14 Gravity 125 014 qmult 00340 1 3 4 easy math: fiducial-value grav field 2 (fg2) Extra keywords: Hold for tests with fg1 18. Given that the Moon’s mass M Mo = 0 . 0123 × M Ea ≈ (1 / 80) M Ea and mean radius R Ea = . 273 × R Ea ≈ (1 / 4) R Ea (e.g., Wikipedia 2007sep25) (where M Ea is the Earth’s mass and R Ea is the Earth’s mean radius), compute to 3 SIGNIFICANT FIGURES the gravitational field at the Moon’s surface and give it in MKS and in Earth g-force (i.e., in units of g Ea = 9 . 8225 N / kg, the Earth’s surface mean gravitational field here with a subscript to differentiate it from the more general meaning of g ). a) 2 N / kg; 1 / 5. b) 9 . 8225 N / kg; 1 . 00. c) 1 . 62 N / kg; 1 / 3. d) 1 . 62 N / kg; 0 . 165. e) 9 . 8225 N / kg; 1 / 5. 014 qmult 00400 2 1 2 moderate memory: solid angle definition 19. The differential definition of solid angle is: a) d Ω = r 2 d vector A · ˆ r . b) d Ω = ( d vector A/r 2 ) · ˆ r . c) d Ω = ( r 2 d vector A/r 2 ) ·...
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