The single most important determinant of the temperature, density, radius, luminosity, and pace of evolution of a protostar is its:
A) chemical composition.
B) magnetic field.
C) spin.
D) mass.
E) molecular composition.
D
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Applications to Astronomy: The earth's orbit has a mean radius of 1.5 × 108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014° due to parallax. How many kilometers is this star from Earth?
A. 1.2 × 1011 km B. 1.2 × 1014 km C. 1.2 × 1017 km D. 1.2 × 1020 km
A steel lift column in a service station is a solid cylinder 4.0 m long and 0.20 m in diameter. Young's modulus for this steel is 20 × 1010 N/m2. By what distance does the column compress when a 5000-kg truck is on it?
A) 4.7 × 10-7 m B) 8.0 × 10-7 m C) 3.2 × 10-6 m D) 7.8 × 10-6 m E) 3.1 × 10-5 m
If a light-weight stable nucleus has 12 neutrons, the atomic mass is expected to be about:
a. 6 b.12 c.18 d.24 e.36 amu.
A conducting rod (length = 2.0 m) spins at a constant rate of 2.0 revolutions per second about an axis that is perpendicular to the rod and through its center. A uniform magnetic field (magnitude = 8.0 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the potential difference between the center of the rod and either of its ends?
a. 16 mV b. 50 mV c. 8.0 mV d. 0.10 mV e. 100 mV