a planet with radius of 12km spins at 520revs/s
a) avg speed of a point on the planets equator over 2.5 of a revolution
b)find avg acceleration on stars circumfrance over 3/4 of a rev
c)find distance covered by point on the equator in 1 second
d) find displaement
The Attempt at a Solution
a) if i construct a vector triangle using v1 and v2 at the beginning of 3/2 of a rev and at the end, i can believe i can solve for vavg this way making a triangle where Vavg opposes the angle of 144 degrees...
so i get v=2Pi*Rf
i considered V1and V2 = v
vavg^2 = 2(2Pi*R*f)^2-2(2Pi*R)^2cos144
is this okay?
where ac = centripetal accell
and v = 2pi*R*F
ac = ((2pi*R)*f)^2/R
d)... i think i may have solved displacement above.. perhaps i am confusing the distance and displacement.