Atomic Nucleus: The symbol for a certain isotope of radium is 
Ra. How many nucleons are there in the nucleus of this isotope?
A. 88
B. 138
C. 214
D. 226
E. 314
Answer: D
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Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubble's constant. Suppose H0 = 22 km/s/million light-years. How fast would a galaxy 1000 million light-years away be receding from us?
A) 22 km/s B) 22 million light-years/s C) 22,000 km/s D) 1000/22 km/s E) 0.22 times the speed of light
When a neutron decays to a proton, a(n) __________ particle is emitted
Fill in the blank(s) with correct word
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
A vector 
is added to 
. The resultant vector is in the positive x direction and has a magnitude equal to 
. What is the direction of 
?
A. 74°
B. 100°
C. ?81°
D. ?62°
E. 106°
Give the Kelvin-Planck statement of the Second Law of Thermodynamics
What will be an ideal response?