An innocent mosquito is flying along the interstate and has a collision with a speeding semi. Which one feels a greater force?
A. The mosquito
B. The semi
C. They both feel the same force
D. There are no forces involved
C. They both feel the same force (Newton’s 3rd law— force of body B on body A is the same as the force of body A on body B)
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What is the fate of an open universe?
a. Expansion forever b. Eventual collapse c. Gradual halt to the expansion d. Can't be known without density information.
An open freight car rolls friction free along a horizontal track in a pouring rain that falls vertically. As water accumulates in the car, the car's speed
A) increases. B) decreases. C) doesn't change. D) need more information
The air in your classroom has
A) mass. B) weight. C) energy. D) all of the above E) none of the above
How is the circumference, Cn, of the nth orbit in hydrogen and the de Broglie wavelength, 
of the n th orbit related?
a. 
b. 
c. 
d. 
e. 