Discuss the relationship between young stars and the interstellar medium
What will be an ideal response?
Young stars give off ultraviolet radiation, heating the surrounding gas cloud and causing it to glow as an emission nebula. Solar wind from the young stars pushes on the nebula, which can sweep away the gas, but can also cause compression leading to more new star formation.
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The distance to a star with a parallax angle of 0.2 arc seconds is
A) 0.2 parsec. B) 2 parsecs. C) 5 parsecs. D) 12 parsecs. E) 20 parsecs.
An AC voltage source, with a peak output of 114 V, is connected to a 40.0-? resistor. What is the effective (or rms) current in the circuit?
a. 2.02 A b. 1.43 A c. 2.85 A d. 4.03 A e. 5.70 A
What are the formula masses of water, H20; propene, C3H6; and 2-propanol, C3H8O?
A) water: 18 amu; propene: 40 amu; 2-propanol: 58 amu B) water: 18 amu; propene: 42 amu; 2-propanol: 62 amu C) water: 18 amu; propene: 42 amu; 2-propanol: 60 amu D) water: 18 amu; propene: 44 amu; 2-propanol: 64 amu
Three charges are placed as follows along the x- and y-axes of an xy-coordinate system: q1 = 2.00 ?C at x1 = 0 m, q2 = 4.00 ?C at x2 = 3.00 m, and q3 = 6.00 ?C at y = 4.00 m. What is the electric potential energy of this system of charges?
A) -94.2 mJ B) 94.2 mJ C) 0 J D) -90.0 mJ E) 90.0 mJ