An object moves 10 m east in 30 s and then returns to its starting point taking an additional 70 s. If west is chosen as the positive direction, what is the average speed of the object?
a. 0.20 m/s
c. 0.50 m/s
b. –0.20 m/s
d. 0 m/s
A
Physics & Space Science
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One mole of an ideal gas with a volume of 4.00 liters and a temperature of 0
is mixed with one mole of an ideal gas with a volume of 2.00 liters and a temperature of 100
The volume of the mixture is 6 liters. What is the N/V of the mixture?
a. 
b. 
c. 
d. 
e. 
Physics & Space Science
Based solely on mass and distance from the Sun, which of the following terrestrial planets would you expect to retain the densest secondary atmosphere?
a. Mercury b. Venus c. Mars d. the Moon e. Earth
Physics & Space Science
Which term in the simplified Drake equations depends on sociological factors?
A) NHP B) flife C) fciv D) fnow
Physics & Space Science
What is the length of a simple pendulum with a period of 2.00 s?
A) 19.6 m B) 0.994 m C) 1.22 m D) 1.62 m E) 0.873 m
Physics & Space Science