A coil of wire is connected to a galvanometer. When the coil is rotated in a magnetic field, the galvanometer records a current. The current results because
a. the coil acts like a transformer.
b. the free electrons in the conductor experience a force when they move in the magnetic field.
c. an electromagnetic wave is generated.
d. the wire is ferromagnetic.
e. none of the above.
b
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A 100 gram glass container contains 200 grams of water and 50.0 grams of ice all at 0 src="https://sciemce.com/media/4/a6beff7b8db22a7632.png" class="w-image" />
A 200 gram piece of lead at 100
is added to the water and ice in the container. What is the final temperature of the system? (specific heat of ice = 2,000 J/kg
specific heat of water = 4,186 J/kg
heat of fusion of water = 333.7 kJ/kg, specific heat of glass = 837.2 J/km
specific heat of lead = 127.7 J/km
A. 5.33
B. 4.87
C. 3.65
D. 2.19
E. 1.75
Buoyancy: A steel ball sinks in water but floats in a pool of mercury, which is much denser than water. Where is the buoyant force on the ball greater?
A. floating on the mercury B. submerged in the water C. It is the same in both cases. D. It cannot be determined from the information given.
Based on available data, what kind of objects in our solar system do most of the known extrasolar planets resemble?
A) jovian planets B) terrestrial planets C) Kuiper belt objects D) None of the above: most extrasolar planets apparently belong to some new category of object.
When light enters glass from air, which of these properties of the light change?
a. frequency b. wavelength c. speed d. all of the above