A truck moves 70 m west, then moves 120 m east, and finally moves west again a distance of 90 m. If east is chosen as the positive direction, what is the truck's resultant displacement?
a. 40 m
c. 280 m
b. - 40 m
d. -280 m
B
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Nearly every aspect of astronomy is related in some way to the existence of gravity and to the motions which are responsible for a balance against gravity
How does this balance play a role for the miscellaneous objects of the solar system (i.e., the asteroids and comets)? How can some aspect of this be used as a tool to determine masses in the solar system?
Based on current scientific evidence, what is the likelihood that life on Earth was created by some omnipotent being?
A) very unlikely but not impossible B) impossible C) certain D) very likely
Helium fusion does not begin until the star has entered the giant region of the H-R diagram
a. True b. False 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 pressure of solar radiation on sphere 2 to that on sphere 1 is
a. 0.25. b. 0.50. c. 1.0. d. 2.0. e. 4.0.