If Earth did not spin, the magnetic field around it would not exist.
Answer the following statement true (T) or false (F)
True
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From what cosmic epoch do the photons in the cosmic background radiation originate?
A) the end of the era of nuclei B) during the era of nucleosynthesis C) during the era of galaxy formation D) the end of the Planck era E) the moment of the Big Bang
Helium production ceased when the universe was about ________ minutes old, and did not resume until the first generation of stars formed
Fill in the blank(s) with correct word
During takeoff a jet aircraft goes from 0 m/s to 60 m/s in 5 seconds. (a) What is the jet's acceleration? (b) What is the jet's speed after 22 seconds?
A bar magnet is held near a single closed loop of wire. The magnet is aligned with the loop axis, and the north pole is facing the loop. If the magnet is moved away, the current induced in the loop will be in a ________ direction as viewed from the side the magnet is on.
Fill in the blank(s) with the appropriate word(s).