Velocity: If you run a complete loop around an outdoor track of length 400 m in 100 s, find your(a) average velocity and (b) average speed.
Fill in the blank(s) with the appropriate word(s).
(a) 0 m/s (b) 4 m/s
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Earth's average density is about _____
A) 5.5 g/cm3 B) 6.5 g/cm3 C) 7.5 g/cm3 D) 8.5 g/cm3
Modern observations have shown that the geometry of the Universe is ____
a. flat, and the Universe must be infinite b. flat, and the Universe must not be infinite c. open, and the Universe must be infinite d. closed, and the Universe must be infinite e. closed, and the Universe must not be infinite
If one uses the classical expression for kinetic energy (1/2 m v2 ) for a particle traveling at half the speed of light, the result will be deficient by how many percent?
A) 13% B) 7% C) 1% D) 24% E) 27%
The half-life of 131I is 8.04 days. Three days after it was prepared, its activity was 0.50 mCi. How many curies (in mCi) were initially prepared?
a. .60 b. .70 c. .65 d. .55 e. .39