Approximately how long ago was Pluto discovered?
A) about 2000 years ago
B) about 25 years ago
C) about 75 years ago
D) in ancient history
E) about 200 years ago
C
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________ galaxies may contain a few million to few trillion solar masses.
A. Spiral B. Independent of their type C. Irregular D. Elliptical
A 2.0-kg block slides on a rough horizontal surface. A force (P = 6.0 N) is applied to the block as shown. The magnitude of the block's acceleration is 1.2 m/s2. What is the magnitude of the force of friction acting on the block?
A. 2.0 N B. 1.4 N C. 1.6 N D. 2.8 N E. 3.4 N
Studying the magnetospheres of the jovian planets has allowed us to measure their
A) orbital periods. B) interior rotation rates. C) ring system diameters. D) gravity. E) orbital radius.
The equation 1/2 N2 + 3/2 H2? NH3 is not appropriately written because
a. the number of atoms of each element on each side is not the same. b. fractional coefficients are not generally used. c. nitrogen is not diatomic. d. the product is N2H4, not NH3.