The Very Long Baseline Array (VLBA)
a. is the highest resolution optical telescope ever built.
b. is located in Arecibo, Puerto Rico.
c. is a matched pair of 8 m telescopes, one of which is in Chile and the other in Hawaii.
d. is an air-borne infrared telescope.
e. is a set of radio telescopes linked together electronically to provide very high resolution.
e
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Ideal metals form close-packed crystal structures because the positive ______________cores pack like spherical billiard balls.
Fill in the blank(s) with the appropriate word(s).
The period of Jupiter's orbit around the sun is approximately 12 years. What is the approximate distance from the sun to Jupiter?
a. 144 AU b. 1728 AU c. 42 AU d. 5.2 AU e. 2.3
The Crab Nebula and the Orion Nebula are regions where new stars are being formed
Indicate whether the statement is true or false
A building made with a steel structure is 650 m high on a winter day when the temperature is 0°F. How much taller (in cm) is the building when it is 100°F? (The linear expansion coefficient of steel is 11 × 10^?6 (°C)?1.)
a. 71 b. 36 c. 40 d. 46 e. 65