A convex mirror has a focal length of ?20 cm. What is the object distance if the image distance is ?10 cm?
A. 10 cm
B. 40 cm
C. 60 cm
D. 20 cm
E. 30 cm
Answer: D
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A) to the right of Polaris; that is, 90 degrees counterclockwise from its current position B) to the left of Polaris; that is, 90 degrees clockwise from its current position C) directly above Polaris D) still in the same place, below Polaris
Alien astronomers are using the radial-velocity method to look for planets around our Sun. Which planet are they most likely to detect first?
A. Jupiter B. Neptune C. Mercury D. Earth
A stick is moving along the x-axis at 90%c. A person riding with the stick sees it inclined at 45.° with respect to the x-axis. Observers in the rest frame see the stick making what angle with respect to the x-axis?
A) 79.° B) 66.° C) 53.° D) 45.° E) 88.°
A gas is confined to a rigid container that cannot expand as heat energy is added to it. This process is
A) isothermal. B) isometric. C) isobaric. D) isentropic. E) adiabatic.