What law explains why a rotating, collapsing cloud forms a flat protostellar disk around a protostar?
A) Kepler's third law
B) the universal law of gravitation
C) Wien's law
D) conservation of angular momentum
D
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Index of Refraction: The speed of light in a certain material is measured to be 2.2 × 108 m/s. What is the index of refraction of this material? (c = 3.0 × 108 m/s)
A. 1.1 B. 1.2 C. 1.4 D. 1.6 E. 1.8
When a dielectric material is introduced between the plates of a parallel plate capacitor the capacitance increases by a factor of 4. What is the dielectric constant of the material introduced between the plates?
A) 0.4 B) 1/4 C) 2 D) 4 E) None of the other choices is correct.
The horizontal and vertical components of the initial velocity of a football are 16 m/s and 20 m/s respectively. If there is no air, how long does it take the football to reach the top of its trajectory?
A) 1.0 s B) 2.0 s C) 3.0 s D) 4.0 s E) 5.0 s
A gas expands from an initial volume of 30.0 L to a final volume of 65.0 L at a constant pressure of 110 kPa. How much work is done by the gas during this expansion?
A) 3.85 MJ B) 3.85 kJ C) 10.4 kJ D) 3850 kJ E) 10.4 MJ