An object is 12 cm in front of a converging lens with focal length 4 cm. Where is the image?

A)

8.0 cm in front the lens
B)

8.0 cm behind the lens
C)

6.0 cm in front of the lens
D)

6.0 cm behind the lens
E)

4.0 cm in front of the lens


D

Physics & Space Science

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If a freely-falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s2, then its speed reading would increase each second by

A) 10 m/s. B) 20 m/s. C) 30 m/s. D) 40 m/s. E) depends on its initial speed

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If the Universe had ________, that would resolve Olbers' paradox.

A. sources of new matter, like white holes B. more mass than electromagnetic radiation C. more electromagnetic radiation than mass D. a finite age E. an infinite extent

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Explain what happens when the angular speed of the coil in an electric generator is increased

What will be an ideal response?

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An object attached to the end of a string swings in a vertical circle (R = 1.2 m), as shown. At an instant when ? = 30°, the speed of the object is 5.1 m/s and the tension in the string has a magnitude of 20 N. What is the mass of the object?

A. 2.0 kg B. 1.5 kg C. 1.8 kg D. 1.2 kg E. 0.80 kg

Physics & Space Science