At an age of 380,000 years, the temperature of the universe had fallen to 3000 k, and electrons could then combine with protons to produce hydrogen gas instead of roaming freely through space.
what major transition occurred as a consequence of this change in the universe at this time?

a) the present laws of physics were applicable to the properties of the universe time.
b) the universe became transparent to light for the first time.
c) nuclear fusion no longer occurs below this temperature, and so, general fusion throughout the universe would have ceased.
d) the universe would have lost its electrical charge suddenly to become elect.

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

What are igneous intrusions and extrusions

Afigure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 20.9 12000 200 3.33