The pitching of a ship in the ocean is an oscillatory periodic motion. A ship is pitching 60 above and 60 below a period of 20 s from its horizontal plane. Consider the following statements in regard:
1. The motion has a frequency of oscillation (i.e., pitching) of 3 cycles/minute.
2. The motion has an angular frequency of 3.14 rad/s.
3. The angular velocity of precession of ship’s rotor is $\pi ^{2}/300rad/s$
4. The amplitudes of pitching is $\pi /300$ rad/.
Which of these statements are correct?
(a) 1 and 2 (b) 1,2 and 4
(c) 2,3 and 4 (d) 1,3 and 4