An object travels at a constant speed 
exactly once around a circle of radius r. The magnitude 
of the object’s average acceleration is:
A. 
B. Zero
C. Something else (specify)
B. Zero
Physics & Space Science
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Radioactivity Basics: Neodymium 
Nd is an isotope that undergoes alpha decay. What isotope is the product of this decay?
A. 
Ba
B. 
Ce
C. 
Pr
D. 
Sm
E. 
Gd
Physics & Space Science
How much work is done by a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?
a. 0.22 kJ b. 0.20 kJ c. 0.24 kJ d. 0.27 kJ e. 0.31 kJ
Physics & Space Science
To be dimensionally consistent, distance [L], velocity [L/T], and acceleration
must be related as follows.
A. 
B. distance = velocity/acceleration
C. 
D. 
Physics & Space Science
All the following types of objects are found almost exclusively in the disk (rather than the halo) of the Milky Way except ________
A) X-ray binaries B) high-mass, red supergiant stars C) young stars D) globular clusters
Physics & Space Science