If a transparent material has an index of refraction of 1.67, what is the speed of light in the material?
What will be an ideal response?
0.599c = 1.80 × 108 m/s
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Reducing the magnetic field to 71% of its previous value changes the magnetic energy density in the field to _______% of its original value.
A. 39 B. 50 C. 71 D. 85 E. 15
Buoyancy: A 4.7-kg solid sphere, made of metal whose density is 4000 kg/m3, hangs by a light cord. When the sphere is immersed in water, what is the tension in the cord? The density of water is 1000 kg/m3.
A. 35 N B. 40 N C. 46 N D. 52 N E. 58 N
The energy output of a typical nuclear reactor is via
A) heating water to form steam. B) directing steam to a turbine. C) spinning a turbine to generate electricity. D) all of the above E) none of the above
A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone pass each other?
a. 17 m b. 21 m c. 18 m d. 27 m e. 31 m