When the vector sum of three co-planar forces, 
, 
, and 
, is
parallel to , we can conclude that and
A.
B.
C.
.D.
.E.
.Answer: C
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When a star has exhausted all of its hydrogen, it is said to have reached the zero-age main sequence (ZAMS)
Indicate whether the statement is true or false
Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the sun respectively. The ratio of the gravitational force exerted by the sun on sphere 1 to the pressure of solar radiation on sphere 1 is T1; the ratio for sphere 2 is T2 . The ratio of T2 to T1 is
a. 0.25. b. 0.50. c. 1.0. d. 2.0. e. 4.0.
The horizontal speed of a projectile
a. is zero b. stays constant c. continuously increases d. continuously decreases e. sometimes decreases and sometimes increases
Based on the information given in Table 7.1, which dots on each plot correspond to which planets? Which correspond to the terrestrial planets, and which to the jovian planets?
What will be an ideal response?