Help needed! 1: Why were Tycho and Kepler a good team?
2: How did changing the shape of the planet orbits help Kepler explain planetary movement?
3: What is an ellipse?
4: Does Kepler’s 2nd Law of Planetary Motion apply to satellites? Why or why not?
5: What made it possible for Kepler to come up with his ideas on planetary motion?

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.