PPT PHY10 WK 11 Universal Law of Gravitation
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Transcript of PPT PHY10 WK 11 Universal Law of Gravitation
• Force of Attraction between Bodies•Determination of Acceleration Due to Gravity •Application to Uniform Circular Motion
Newton’s Law of Gravitation
Determining the Acceleration Due to Gravity, g
Application: Satellites in Circular Orbits
There is only one speed that a satellite can have if the satellite is to remain in an orbit with a fixed radius.
Satellites in Circular Orbits
r
vm
r
mMGF E
c
2
2
r
GMv E Satellites Orbital Speed
Satellites in Circular Orbits
T
r
r
GMv E 2
EGM
rT
232
Example : Orbital Speed of the Hubble Space Telescope
Determine the speed of the Hubble Space Telescope orbitingat a height of 598 km above the earth’s surface.
hmi16900 sm1056.7
m10598m1038.6
kg1098.5kgmN1067.6
3
36
242211
v
Sample Problems