Clusters of galaxy clusters are known as _____
A) megaclusters
B) hyperclusters
C) monoclusters
D) superclusters
D
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Buoyancy: A hot air balloon along with its cargo has a mass of 4.0 × 105 kg, and it holds 7.0 × 105 m3 of hot air. It is floating at a constant height in air with a density of 1.29 kg/m3. What is the density of the hot air in the balloon?
A. 1.4 kg/m3 B. 0.72 kg/m3 C. 0.57 kg/m3 D. 0.86 kg/m3 E. 0.43 kg/m3
If the intensity of radiation from the sun is 
at a distance of 
at what distance is the intensity 
A. 
B. 
C. 
D. 
E. less than 
km
An object of mass m is hanging by a string from the roof of an elevator. The elevator is increasing its upward speed. What is the tension in the string?
A. greater than mg B. less than mg C. equal to mg D. depends on the speed of the elevator
What happens because of the formation of atoms?
A.) Nucleosynthesis. B.) Formation of protons. C.) Formation of quarks. D.) The cosmic microwave background is produced. E.) The Universe starts to contract.