The _____ of an object is the angular distance from one edge to the other
A) angular volume
B) angular momentum
C) angular velocity
D) angular diameter
D
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In which case will the woman see a just a spectrum that is almost entirely black except for few bright emission lines?
A) 1 B) 2 C) 3 D) 4
What is the absolute magnitude of our Sun?
A) -23.0 B) -4.6 C) -1.4 D) +4.8 E) +9.4
A hemispherical surface (half of a spherical surface) of radius R is located in a uniform electric field of magnitude E that is parallel to the axis of the hemisphere. What is the magnitude of the electric flux through the hemisphere surface?
a. ?R2E b. 4?R2E/3 c. 2?R2E/3 d. ?R2E/2 e. ?R2E/3
You are standing on a platform and a train approaches you, moving at a constant velocity. Its whistle is blowing continuously. The train does not stop at the platform, but it continues to move past the platform at a constant velocity. Which of the following statements are true about the frequency of the train's whistle that you hear?
1.The whistle's frequency that you hear increases continually as the train approaches the platform and then decreases continually after the train passes the platform. 2.The whistle's frequency that you hear seems to you to remain constant for the entire duration of the train's passage. 3.The whistle's frequency that you hear decreases continually as the train approaches the platform and then increases continually after the train passes the platform. 4.The whistle's frequency that you hear remains constant as the train approaches the platform and then decreases immediately after the train passes the platform, after which it remains constant at a lower pitch than it had originally.