What is a particle that has no charge and resides in the nucleus of an atom?
A. Isotope
B. Neutron
C. Electron
D. Proton
B. Neutron
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If there is no dark matter in the Milky Way Galaxy, what is the best alternative explanation for the observations?
A) We are not measuring the orbital velocities of atomic clouds and stars properly. B) We are not measuring the distances to atomic clouds and stars properly. C) We are not attributing enough mass to the visible or "bright" matter. D) We are not observing all the visible or "bright" matter in the galaxy. E) Our understanding of gravity is not correct for galaxy-size scales.
The general theory of relativity deals with the effects of gravity, but the special theory of relativity does not take gravity into account
Indicate whether the statement is true or false
Given that the universe is about 14 billion years old, which of the following statements is logically valid?
A) All galaxies nearby us are about 14 billion years old. B) All galaxies that we can see are about 14 billion years old. C) All galaxies that we see have an age that is approximately equal to the age of the universe today, minus the lookback time (or light travel time) corresponding to the redshift of that galaxy. D) The oldest galaxies we see at great distances are younger than the oldest galaxies we see nearby.
Propanol (C3H8O) is boiled in a container at 101 kPa and where the surface temperature is 120ºC. Its saturation temperature is 97.4º C and its heat of fusion is 697 kJ/kg. Estimate the heat transfer per unit area.
What will be an ideal response?