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1. If some unknown cause of red shift-such as light becoming "tired" from traveling long distances through empty space-is discovered, what effect would there be on cosmology?
2. Olbers's paradox poses an interesting question: If the universe is infinite, then any line of sight should eventually fall on a star's surface. Why then is the sky dark at night? Discuss the commonly accepted evolution of the universe as a solution to this paradox.
You are asked to design a spring that will give a 1310-kg satellite a speed of 3.50 m/s relative to an orbiting space shuttle, What must the force constant of the spring be
Assuming that the upper surface of the ice sheet is at -13?C and the bottom surface is at 0 ?C, calculate the time it will take to form an ice sheet 25cm thick
find the speed of the test charge when it reaches the center of the square.
A box starts out at the top of a frictionless ramp, then slides down. The ramp has a height h = 2 meters, What is the kinetic energy of the box at the bottom of the ramp
In one day, a 81-kg mountain climber ascends from the 1410-m level on a vertical cliff to the top at 2208 m. The next day, she descends from the top to the base of the cliff, which is at an elevation of 1215 m.
How many electrons would have to be removed from one sphere and added to the other to cause an attractive force between the spheres of magnitude 1.00 x 10^4 N (roughly one ton)? Assume that the spheres may be treated as point charges.
find at least five internet or magazine articlesadvertisements which depict an exercise or health myth. why do you
The temperature of the surface of a certain star is 7500 K. Most hydrogen atoms at surface of the star are in the electronic ground state. What is the approximate fraction of hydrogen atoms that are in the first excited state (and therefore could ..
A ball is moving at 4m/s and has a momentum of 48 kgm/s. What is the ball's mass
two blocks connected by a light cord over a pulley. This apparatus is known as an Atwood's machine. what is the speed of the lighter block
a 250 kg flatcar 30 m long is moving with a speed of 3.0 ms along horizontal frictionless rails. a 61 kg worker starts
two identical conducting spheres fixed in place attract each other with an electrostatic force of 0.108 n when
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