The average speed of a horse that gallops 10 kilometers in 30 minutes is
A) 15 km/h.
B) 20 km/h.
C) 30 km/h.
D) 40 km/h.
Answer: B
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The cheapest and probably most effective means of interstellar communication is ________
Fill in the blank(s) with correct word
A megaton explosion releases
How much mass is converted into energy in this process?
A. none, if it a result of a chemical reaction
B. none, since mass is conserved
C. 50 kg
D. 50 g
E. 
The cosmic microwave background radiation argues in favor of the Big Bang model.
Answer the following statement true (T) or false (F)
A long hollow cylindrical conductor (inner radius = 2.0 mm, outer radius = 4.0 mm) carries a current of 12 A distributed uniformly across its cross section. A long wire which is coaxial with the cylinder carries an equal current in the same direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
a. 1.1 mT b. 1.4 mT c. 1.7 mT d. 2.0 mT e. 0.2 mT