1. In a circular motion, the radius r = 20 m, and the tangential speed v = t² + 1, where t is in unit s and v is in unit m/s. What are magnitudes of the instantaneous tangential acceleration and centripetal acceleration at t=3 s?

6. A uniform spherical planet has mass M and radius R. A very thin tunnel passes from one end of the planet, through the planet center, and then out from the other end of the planet. A particle of mass m fell into one end of the tunnel and then performed simple harmonic motion. Find the angular frequency of the simple harmonic motion.

1. In a circular motion, the radius r = 20 m, and the tangential speed v = t² + 1, where t is in unit s and v is in unit m/s. What are magnitudes of the instantaneous tangential acceleration and centripetal acceleration at t=3 s?

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