1) Astronomers are proud of their telescopes, and often say they can \"resolve a

ID: 2296573 • Letter: 1

Question

1) Astronomers are proud of their telescopes, and often say they can "resolve a dime at so many

miles." How many miles can you move a disk (D = 6.0 cm) from a 325-cm-diameter telescope

mirror and just resolve it using light of wavelength 785 nm?

Answer = 61 mi

2) Three charges of magnitude 9.0 x 10-4 C each are located at x = 1.0 m, y = 0.0 m, at x = 0.0 m,

y = 0.0 m, and at x = -1.0 m, y = 0.0 m. The one in the middle is negative, while the other two

are positive. What is the net Coulombic force exerted by them on a negative 9.0 x 10-5 C

charge located at x = 0.0 m, y = 2.0 m? (The value of k is 9.0 x 109 N

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