A convex mirror with focal length of -20 cm forms an image 15 cm behind the surface. Where is the object located as measured from the surface?
a. 30 cm
c. 15 cm
b. 7.5 cm
d. 60 cm
D
Physics & Space Science
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How much time is there between when a star rises and when it sets?
A. about twelve hours B. more than twelve hours C. less than twelve hours D. It depends on the star.
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What is the angular speed in rad/s of an electric motor that rotates at 1.80 × 103 rpm?
What will be an ideal response?
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Which of the following materials would you expect to be isotropic?
(a) A casting of aluminum (b) Aluminum foil (c) Aluminum wire (d) A polyethylene sheet 0.01 cm (0.004 inch) thick
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Process of Science: Astronomers have not found any stars without some heavy elements. How does this constrain theories for the formation of the first generation of stars in the Universe?
What will be an ideal response?
Physics & Space Science