A rabbit runs across a parking lot on which a set of coordinate axes has, strangely enough, been drawn. The co-
ordinates (meters) of the rabbit's position as functions of
time t (seconds) are given by
x = -0.31t2 + 7.2t + 28
and
y = 0.22t2 – 9.1t + 30.
Att = 15 s, what is the rabbit's position vector r in unit-
vector notation and in magnitude-angle notation?

Acentrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. when switched off, it rotates through 54.0 revolutions before coming to rest. find the constant angular acceleration (in rad/s2) of the centrifuge. your response is within 10% of the correct value. this may be due to roundoff error, or you could have a mistake in your calculation. carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/s2