Three identical resistors are connected in series to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?
A)
12 A
B)
4 A
C)
36 A
D)
24 A
E)
zero
A
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A small underwater pool light is 2.25 m below the surface of a swimming pool. What is the radius of the circle of light on the surface, from which light emerges from the water? (nwater = 1.333)
a. 3.90 m b. 1.98 m c. 2.55 m d. 2.90 m e. 1.69 m
The left-hand end of a glass rod is ground to a spherical surface. The glass has index of refraction 1.50. A small object 4.00 mm tall is placed on the axis of the rod, 37.0 cm to the left of the vertex of the spherical surface
The image is formed in the rod, 50.0 cm to the right of the vertex. (a) What is the magnitude of the radius of curvature of the spherical surface at the end of the rod? (b) What is the height of the image?
Aristotle's hypothesis was that:
A) lunar eclipses were created by our shadow. B) only a spherical Earth would always cast a circular shadow on the Moon. C) lunar eclipses would have to happen every full moon. D) the Sun lay at the center of the planet orbits. E) the Moon orbited the Earth.
Lilies in a certain pond double their total lake area covered every week. One day you notice that the pond is 1/8 covered with lilies. How long will it be before the pond is totally covered with lilies?
A) 3 weeks B) 8 weeks C) 6 weeks D) 4 weeks E) It is impossible to answer this without knowing the total area of the pond.