Process of Science: What evidence do scientists have that supermassive black holes exist?
What will be an ideal response?
Observations of orbiting stars and gas clouds in galaxies show that they are orbiting extremely massive (tens of millions of solar masses) objects that are invisible.
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As viewed from above or face-on, a ____________ spiral galaxy has many branches and spurs, making the arms less discernible
Fill in the blank(s) with correct word
An isotope of the element Manganese (Mn) has an atomic number of 25 and a mass number of 55. Assuming the atom is neutral, this means it has
A) 55 protons, 55 electrons, and 25 neutrons B) 25 protons, 25 electrons, and 30 neutrons C) 25 protons, 30 electrons, and 25 neutrons D) 25 protons, 25 electrons, and 55 neutrons
When a boxer moves into an oncoming punch, the force experienced is
A) decreased.
B) increased.
C) no different, but the timing is different.
D) all of the above
The flow of groundwater is dependent on
A) topography of the ground surface. B) gravity only. C) pressure only. D) hydraulic conductivity and pressure.