13. A converging lens has a focal point that is 6.0 cm from its center. If an observer looks through the
lens at an object 1.5 cm from the lens, what will the image look like? Is it real or virtual? Is it upright
or inverted? Is the image magnified, reduced, or essentially the same size as the object?

Answerthe distance between the two ends of the galaxy is 150,000 light years;

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.