 #1
simphys
 298
 43
 Homework Statement:

The planets Venus, Earth, and Mars all move in approximately
circular orbits around the sun. Use the data in the table to find (a) the
speed of each planet in its orbit and (b) the centripetal acceleration of each
planet. (c) As the size of a planet’s orbit increases, does the speed increase
or decrease? Does the centripetal acceleration increase or decrease?
Planet Orbital radius (m): Venus 1.08 * 1011 Orbital period (days): 225
Planet Orbital radius (m): Earth 1.50 * 1011 Orbital period (days): 365
Planet Orbital radius (m): Mars 2.28 * 1011 Orbital period (days): 687
 Relevant Equations:
 a = v^2 / R
I don't understand part (c) the answer is decreasing for both. I would have it decreasing for the centripetal acceleration and then increasing for the velocity, why is that not correct?
Thanks in advance!
Thanks in advance!