The cosmic microwave background is almost perfectly uniform in all directions, except for very small deviations in its temperature. What do scientists think these small deviations represent?
A) regions of slightly higher density that made it possible for galaxies to form
B) small increases in temperature caused by individual stars
C) The warmer spots represent regular matter and the cooler spots represent dark matter.
D) regions of slightly higher helium abundance in the early universe
E) varying redshifts and blueshifts due to motions of gas in the early universe
A) regions of slightly higher density that made it possible for galaxies to form
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Indicate whether the statement is true or false
A battery supplies
a. AC current. b. DC current. c. resistance. d. voltage. e. positive ions.
A large stone is resting on the bottom of the swimming pool. The normal force of the bottom of the pool on the stone is equal to the
a. weight of the stone. b. weight of the water displaced. c. sum of the weight of the stone and the weight of the displaced water. d. difference between the weight of the stone and the weight of the displaced water.
For which of the graphs was the result most curved, and closest to the one we are familiar with for the planet orbits about the Sun?
A.) 0%. B.) 25%. C.) 50%. D.) 75%. E.) 100%.