The moment of inertia of a helicopter's rotor is 320kg.m². The rotor starts from rest and at t = 0, the pilot begins by advancing the throttle so that the torque exerted on the rotor by the engine (in N.m) is modelled by as a function of time (in seconds) by T = 250t. a) How long does it take the rotor to turn ten revolutions? b) What is the rotor's angular velocity (in RPM) when it has turned ten revolutions?

1. The wheel starts rotating from rest, 5) if its angular velocity W as a function of angular position is w=0.2-0², where 0 is in radian, and its radius ris 0.3 m, what is the magnitude of the total linear acceleration (in m/s2) of point P after the wheel has turned 1.4 revolution(s) from rest. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point. Your Answer: Answer P

Solve it correctly please. I will rate accordingly with 3 votes.

20- An athlete is running in a parking lot on which the coordinate axes are drawn. The coordinates of the athlete's position are given as x=-0.31t^2+7.2t+28 and y=0.22t^2-9.1t+30 as a function of time t. Find the magnitude of the athlete's acceleration vector a (m/s2) at t=15s. A) 1,98 B) 0,58 C) 1,23 D) 0,76 E) 1,45