Two converging lenses, the first with focal length 10.0 cm and the second with focal length 20.0 cm, are separated by 40.0 cm. An object, 3.00 cm in height, is placed 30.0 cm in front of the first lens. Where is the final image formed?
A. 11.1 cm after the second lens
B. 100 cm after the second lens
C. 45.0 cm after the second lens
D. 5.00 cm after the second lens
E. 5.00 cm before the second lens
B. 100 cm after the second lens
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A flux of 4 × 10-5 Wb is maintained through a coil for 0.5 s. What emf is induced in this coil by this flux?
A) No emf is induced in this coil. B) 2 × 10-5 V C) 8 × 10-5 V D) 6 × 10-5 V E) 4 × 10-5 V
Some light switches that glow in the dark after the lights are turned off employ
A) fluorescence. B) resonance. C) incandescence. D) all of the above E) none of the above
The principle of equivalence states that
A) the laws of physics are the same in all inertial frames of reference. B) the speed of light is the same in any frame of reference. C) clocks that move relative to one another keep time at different rates. D) the length of an object depends on its speed relative to a given observer. E) all physical experiments conducted in a uniform gravitational field and in an accelerated frame of reference give identical results.
How did seafloor spreading suggest a driving force for continental drift?
A) Youngest seafloor is found near continents. B) Seafloor spreading pushes continents. C) Mantle convection causes irreversible slippage. D) Subduction creates the youngest seafloor.