Posted by vv on Tuesday, September 17, 2013 at 9:03am.
Earth speeds along at 29.8 km/s in its orbit. Neptune's nearly circular orbit has a radius of 4.5 x 109 km, and the planet takes 164.8 years to make one trip around the Sun. Calculate the speed at which Neptune plods along in its orbit.

Physics  bobpursley, Tuesday, September 17, 2013 at 10:34am
speed=distance/time=2PI*radius/164.8 years
now, convert years to seconds and you have it.

Physics  vv, Tuesday, September 17, 2013 at 11:49am
yes i solve it like this but we will not need the speed of the earth ?
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