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helpmeplease8
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Homework Statement
A centripetal-acceleration addict rides in uniform circular motion with period T = 4 s and radius r = 3.00 m. At one instant his acceleration is a = (7.00 m/s2)i + (-3.00 m/s2)j . At that instant, what are the following values?
(a) v·a
(b) r x a
Homework Equations
2∏r/T = speed
v^2/r = acceleration
(4*∏^2*r)/T^2 = acceleration
The Attempt at a Solution
a) (32.97m^2/s^3)i + (-14.13m^2/s^3)j
b) (21m^2/s^2)i + (-9m^2/s^2)j
Are these right?