NH3 is an example of
A) a molecule only
B) a compound only
C) both a molecule and a compound
D) a collection of isolated atoms
C
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Spherical Mirrors: An object is placed 15 cm from a spherical concave mirror with a focal length of magnitude 20 cm. If the object is 4.0 cm tall, how tall is the image?
A. 1.0 cm B. 2.0 cm C. 8.0 cm D. 16 cm
The current definition of a kilogram is the mass of a platinum-iridium cylinder kept in
a. the United States. b. France. c. England. d. Japan.
A particular lightbulb produces 8 J of thermal energy while producing 2 J of radiant energy, and this is its entire energy output during this time. How energy-efficient is this bulb [as a producer of light]?
A) 400% B) 20% C) 25% D) 500% E) 80%
A flask half filled with water is on a weighing scale. If you float a piece of wood in it, the scale reading will be
A) less. B) the same. C) greater.