Based on current evidence, a supercluster is most likely to have formed in regions of space where
A) the density of dark matter was slightly higher than average when the universe was very young.
B) there was an excess concentration of hydrogen gas when the universe was very young.
C) supermassive black holes were present in the very early universe.
D) the acceleration of the expansion was proceeding faster than elsewhere.
A
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Polarization: An ideal polarizer with its transmission axis rotated 30° to the vertical is placed in a beam of unpolarized light of intensity 10 W/m2. After passing through the polarizer, what is intensity of the beam?
A. 2.5 W/m2 B. 5.0 W/m2 C. 8.7 W/m2 D. 7.5 W/m2 E. 10 W/m2
The strong nuclear force is the force that holds the protons and neutrons in the nucleus together
Based on the fact that atomic nuclei can be stable, briefly explain how you can conclude that the strong force must be even stronger than the electromagnetic force, at least over very short distances.
A 60.0-kg mass person wishes to push a 120-kg mass box across a level floor. The coefficient of static friction between the person's shoes and the floor is 0.700
What is the maximum coefficient of static friction between the box and the floor such that the person can push horizontally on the box and cause it to start moving? A) 0.333 B) 0.500 C) 0.350 D) 0.667 E) 0.700
A beaker of negligible heat capacity contains 456 g of ice at -25.0°C. A lab technician begins to supply heat to the container at the rate of 1000 J/min
How long after starting will the ice begin to melt, assuming all of the ice has the same temperature? The specific heat of ice is 2090 J/kg ? K and the latent heat of fusion of water is 33.5 × 104 J/kg.