Barnard's star is 5.9 ly from Earth. Its parallax angle is 0.55". Note 1 pc is 3.26 ly and 1 ly is 63200 AU
a. True
b. False
Indicate whether the statement is true or false
True
RATIONALE: Convert from ly to pc.
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A piece of soft iron is placed in a solenoid increasing the magnetic field in an arrangement that can be switched on and off. Such a device is called
A) an electromagnet. B) an electrosolenoid. C) a permanent magnet. D) a ferromagnet. E) a hysteresis loop.
Thermal Expansion: A steel bridge is 1000 m long at -20°C in winter. What is the change in length when the temperature rises to 40°C in summer? The average coefficient of linear expansion of this steel is 11 × 10-6 K-1.
A. 0.33 m B. 0.44 m C. 0.55 m D. 0.66 m
When looking for the "Doppler Wobble" (radial velocity changes detected due to Doppler shifts), which mass combination is most likely to be detected?
A) High mass star, high mass planet B) High mass star, low mass planet C) Low mass star, high mass planet D) Low mass star, low mass planet E) A high mass planet; the mass of the star is irrelevant.
Parallels of latitude are parallel to the
a. longitude. b. International Date Line. c. equator. d. meridian.