Scientists have detected thousands of gamma ray bursts. The evidence suggests that most or all of these bursts
A) have occurred in the central regions of the Milky Way.
B) have occurred in distant galaxies.
C) come from the same types of close binary systems that produce X-ray bursts.
D) come from the Oort cloud surrounding the Sun.
B
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The potential difference between the plates of a parallel plate capacitor with the plate separation of 6 cm is 60 V. What is the electric field between the plates of this capacitor?
A) 60 V/m B) 500 V/m C) 1000 V/m D) 2000 V/m E) 3600 V/m
San Francisco has milder winters than Washington D.C. due to water's high
A) conductivity. B) specific heat capacity. C) temperature in the Pacific Ocean.
A 4.00 kg mass is located at (2.00 m, 2.00 m, 0.00 m) and a 3.00 kg mass is located at (–1.0 m, 3.00 m, 0.00 m). If this system of masses rotated about the X-axis perpendicular to the Z-Y plane, then the moment of inertia of this system is
A. 24 kg 
B. 36 kg
C. 43 kg
D. 56 kg
E. 62 kg
Assuming that the wave speed varies little when sound waves are traveling through a material that suddenly changes density by 10%, what percentage of the incident wave intensity is reflected?
a. < 1% b. 7.0% c. 10% d. 20% e. 25%