These four photos shows features of Earth that change with time, some fast and some slow.. Which of these features could not exist if Earth did not have a magnetic field?
Answer : Northern Lights (green)
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What is the reason a type-I supernova slows its dimming after about 2 months?
A) The planetary nebula cooled enough to form a dust shell. B) Energy is released from the decay of radioactive cobalt 56 to iron 56. C) The supernova remnant suddenly becomes transparent. D) The burst of energy carried by neutrinos is finally observed. E) Energy from the supernova's shock wave is released as it hits interstellar matter.
The term probability is associated with the model of the atom proposed by
a. Schrödinger. b. Heisenberg. c. de Broglie. d. Einstein.
A block of mass m is projected across a horizontal surface with an initial speed v. It slides until it stops due to the friction force between the block and the surface. The same block is now projected across the horizontal surface with an initial speed v/2. When the block has come to rest, how does the distance from the projection point compare to that in the first case?
1.It is the same. 2.It is half as large. 3.It is one fourth as large. 4.It is none of these.
An alternative to the nebular theory for the formation of the solar system suggests that the planets formed from blobs of gas that had been gravitationally pulled out of the Sun during the near-collision with another star
This idea is referred to as the A) fragmentation hypothesis B) collision-ejection hypothesis C) encounter hypothesis D) tidal distortion hypothesis