The Universe contains _____________________
a. 22.7% baryonic, 4.5% WIMPs, 72.8% dark energy b. 22.7% normal, 4.5% non-Baryonic, 72.8% dark energy
c. 22.7% non-Baryonic, 4.5% normal, 72.8% dark energy d. 22.7% dark energy, 4.5% baryonic, 72.8% non-baryonic
c
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This famous photograph taken by the Voyager spacecraft shows
A) Earth as viewed from the outskirts of the solar system. B) a close-up of the rings of Neptune. C) the cloud of gas and dust in which our solar system was born. D) the Sun as viewed from the next-nearest star.
The half-life of 30P is 2.50 minutes. If a sample of 30P has 
nuclei present, what is its activity?
a. 
b. 
c. 
d. 
e. 
Discuss advantages and disadvantages of two methods for solving one-dimensional steady conduction problems.
What will be an ideal response?
Ocean waves with a wavelength of 120 m are coming in at a rate of 8 per minute. What is their speed?
a. 8.0 m/s b. 16 m/s c. 24 m/s d. 30 m/s e. 4.0 m/s