A spacecraft traveling out of the solar system at aspeed of 0.95c sends back information at a rate of 1400 kHz. At what rate do we receive theinformation?
4.1 Describing Motion: Examples from Daily Life Monday, September 12, 2016 1:01 PM Chapter 4 Making Sense of the Universe • Understanding Motion,Energy, and Gravity • Review ○ Pattern in the sky ○ Geocentricsolar system ○ Epicycles ○ Heliocentric solar system ○ Elliptical orbits ○ Mountains on the moon How do we describe motion • Precise definition ○ Speed Rate at which object moves ○ Velocity Speed and direction Ex. 10 m/s, due east ○ Acceleration Any chance in Velocity I.e. change in speed and/or direction 2 Units of speed/time(m/s ) • Acceleration of Gravity ○ All falling objects accelerate at the same rate (not counting friction of air resistance) ○ On earth, g = 10 m/s 2 Speed increases 10 m/s with each second of falling ○ Galileo showed that g is the same for all falling objects regardless of their mass On earth, air resistance makes a feather fall slower than a hammer • Momentum and force ○ Momentum = mass x velocity Ex. A bus can have a large momentum even if it is moving very slowly, because it has a large mass ○ A net force changes momentum Which means change in velocity (acceleration) Ex. Two football players pushing against each other ○ Zero net force impli