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Moment of force = force x perp. Distance from pivot
m = m
Centrepetal force acts towards the centre of the orbit
Centrepetal accel. = v²/r
Force = mv²/r
Geostationary Satellites, good for tv/radio/phones because they
stay in the same place over the earth, 24h orbit, HIGH!!
Low Polar orbit, orbits in a few hours, good for spying, weather,
can circumnavigate globe in hours, LOW!!!
Covex LENSES------CONVERGE LIGHT mirror, diverge light
Concave------LIKE A CAVE (diverge light) mirror, converge light
Magnification = image height / object height
Right hand rule...... thumb in direction of current, fingers curl is
way of arrows.
Direction of current in coil, positive to
Left hand motor rule..... 1st finger, north to south
Catapult field 2nd finger, current, into or out of page
3rd finger, motion, mov'mnt of wire
A diode in a generater stops the negative bit, LUMPY DC
Using lots of coils at different angles smooths out the dc
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Human hearing = 20Hz to 20,000Hz
Echos!!!.... Speed = distance/time REMEMBER TO DIVIDE BY 2
(there and back)
V(wave speed) = F(frequency) x (wave length)
Sound is fastest in a solid
Step up transformer has more coils on the second side
Life cycle of a Star.....
Clouds of Dust and Gas (as gravity acts, the force is turned
into thermal energy and temp. Rises.
Hydrogen nuclei undergo NUCLEAR FUSION
NUCLEAR FUSION and gravity oppose each other to make
the stable period.…read more