Earth is approximately 13,000 km in diameter
a. True
b. False
Indicate whether the statement is true or false
True
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You and a classmate are discussing how much work one must do to lift a box of mass m a vertical distance h. Your classmate argues, “You have to exert an upward force on the box at least equal in magnitude to the box’s weight 
, and you lift the box upward a distance h, so you must do work equal to 
. But in addition,” your classmate continues, “ you must increase the box’s gravitational potential energy by 
to lift the box.” What amount of work do you think you need to do on the box to lift it a height h? Be prepared to defend your response. (Hint: What is the system here?)
A. Zero work
B. About 
(if you move the box slowly)
C. Significantly greater than 
but less than 
D. About 
(if you move the box slowly)
E. Significantly greater than 
As life on Earth evolved, its DNA
A) changed gradually into RNA B) stayed the same C) became gradually less complex D) became gradually more complex
The resistivity of the material of a wire is inversely proportional to the resistance of the wire
Indicate whether the statement is true or false
Which of the following properties is more likely to be a characteristic of a halo star in the Milky Way, not a disk star?
A) It could be quite young. B) It has a low ratio of iron to hydrogen. C) It orbits the center of the Milky Way galaxy. D) It is moving very slowly relative to the Sun's motion.