A boat moves at 10.0 m/s relative to the water. If the boat is in a river where the current is 2.0 m/s, how long does it take the boat to make a complete round trip of 1.00 km upstream followed by a 1.00 km trip downstream?
208 s
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Thin Lenses: A plant that is 4.1 cm tall is 10.3 cm from a converging lens. You observe that the image of this plant is virtual and 6.2 cm tall. What is the focal length of the lens?
A. 6.8 cm B. -30 cm C. 16 cm D. 30 cm E. -16 cm
According to the nebular theory of solar system formation, what key difference in their early formation explains why the jovian planets ended up so different from the terrestrial planets?
A) The terrestrial planets formed inside the frost line of the solar nebula and the jovian planets formed beyond it. B) The jovian planets formed in a region with a much higher density of hydrogen and helium gas. C) The terrestrial planets accreted from rock and metal, while the jovian planets were formed by giant balls of pure hydrogen and helium gas. D) The jovian planets began from planetesimals made only of ice, while the terrestrial planets began from planetesimals made only of rock and metal.
The focal length of a convex mirror is has a magnitude of 20 cm. What is its radius of curvature?
A) 40 cm B) -10 cm C) 20 cm D) -40 cm E) -20 cm
In order for two waves to interfere completely destructively, they must have the same amplitude
Indicate whether the statement is true or false