If I fire a cannonball from the top of a mountain, traveling parallel to the Earth's surface at 14,000 miles per hour (6.26km/s), it travels a great distance before falling to Earth. If instead, I fire it at 16,000 miles per hour (7.15km/s) it:
A) travels completely around the Earth before returning to the mountaintop
B) drops to Earth immediately
C) travels the whole way to the Moon, orbits it once, then comes back
D) travels a much smaller distance before falling to Earth
E) travels exactly the same distance before falling to Earth
Ans: A) travels completely around the Earth before returning to the mountaintop
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Suppose 39 g of reactant A is mixed with 40 g of reactant B. After a chemical reaction takes place between A and B, which statement is correct?
a. The total mass of products plus any unreacted reactants will be 79 g. b. The total mass of products plus any unreacted reactants will be less than 79 g. c. The total mass of products plus any unreacted reactants will be more than 79 g. d. The total mass of products will be 79 g.
What is the speed of a proton in a cyclotron having a 0.50 T magnetic field when the proton is at a distance of 25 cm from the center?
a. 
b. 
c. 
d. 
e. 
What is the greatest mass a newborn star can have
A) 10 solar masses. B) 20 solar masses. C) 50 solar masses. D) a few hundred solar masses.
What is an ionization nebula?
A) a region of hot, low-density gas surrounding a recent supernova B) a clump of gas that will soon give birth to a new star C) a colorful cloud of gas that glows because it is heated by light from nearby hot stars D) a name sometimes used to describe spiral galaxies besides the Milky Way