The arrows in this diagram are meant to show how gravitational equilibrium works in the Sun. What do the different colors and different arrow lengths represent?
A) inward pointing green arrows represent gravity
outward pointing red arrows represent pressure
longer arrows represent a stronger push or pull
B) inward pointing green arrows represent gravity
outward pointing red arrows represent the solar wind
longer arrows represent a stronger push or pull
C) inward pointing green arrows represent conduction
outward pointing red arrows represent radiation
longer arrows represent greater intensity
D) inward pointing green arrows represent downward convection
outward pointing red arrows represent upward convection
longer arrows represent stronger convection
A) inward pointing green arrows represent gravity
outward pointing red arrows represent pressure
longer arrows represent a stronger push or pull
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The energy of an ultraviolet photon is ________ a photon in the visible part of the spectrum.
A. shorter than B. longer than C. higher than D. lower than E. faster than
If two identical wires carrying a certain current in the same direction are placed parallel to each other, they will experience a force of repulsion
Indicate whether the statement is true or false
The region around 2b has far fewer craters than the region around 2c) The crater floor at 2a is also flat and smooth, without many smaller craters on it. Why are regions 2a and 2b so smooth?
A) Few small craters ever formed in these regions. B) Erosion erased craters that once existed in these regions. C) Lava flows covered craters that once existed in these regions.
This event recurs and happens when one of the companions in the binary system is a white dwarf.
A. Pulsar B. Type I supernova C. Nova D. Type II supernova E. None of these choices is correct.