The left-hand end of a glass rod is ground to a spherical surface. The glass has index of refraction 1.50
A small object 4.00 mm tall is placed on the axis of the rod, 37.0 cm to the left of the vertex of the spherical surface. The image is formed in the rod, 50.0 cm to the right of the vertex.
(a) What is the magnitude of the radius of curvature of the spherical surface at the end of the rod?
(b) What is the height of the image?
(a) 8.8 cm (b) 3.60 mm
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A. 20 m B. 40 m C. 60 m D. 80 m E. 100 m
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Which of the following best describes why scientists seek to identify even small asteroids that could potentially hit Earth?
A) to try to prevent an impact that might destroy a town or city B) to try to prevent an impact that might cause the extinction of the human race C) to help us understand the origin of the solar system D) to allow us to capture the asteroids and use them for their resources
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.