What is postulated to have caused a sudden inflation of the early universe?
A) the energy absorbed by giant quantum fluctuations
B) the energy released from the "freezing out" of the strong force from the GUT force
C) the energy released from the annihilation of matter and antimatter
D) the energy absorbed by the separation of the electromagnetic and weak forces
E) the energy released in the fusion of protons and neutrons to produce helium
B
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By how much will a slab of concrete 18. m long contract when the temperature drops from 24.°C to -16.°C? (The coefficient of linear thermal expansion for concrete is 12 × 10-6 per degree C.)
A) 1.5 cm B) 0.86 cm C) 70. mm D) 15. cm E) 0.5 cm
Stellar spectra tell us that ________ is the second most abundant element in the Sun
A) carbon B) helium C) iron D) hydrogen E) oxygen
What evidence do we have that Earth has a molten core?
What will be an ideal response?
A force of 100 N is applied to a rod with a diameter of 6.00 mm. The stress in the rod is
a. 
b. 
c. 
d. 
e. 