practice exam physics please help
A 0.150-kg rubber stopper is
attached to the end of a 1.00-m string and is swung in a circle.
a) If the stopper makes 0.85 rev/s, what is the force the string exerts on the stopper? (1pt)
b) If the rubber stopper is swung 2.3 m above the ground and released, how far will the stopper travel horizontally before hitting the ground?(1pt)
A person on a ferry walks at a speed of 2.0 m/s. The ferry's velocity is 5.0 m/s north.
a) In which direction should the person walk to have the maximum possible speed relative to a person standing on the dock? What is this speed?(1pt)
b) In which direction should the person walk to have the smallest possible speed relative to a person standing still on the dock? What is this speed?(1pt)