What is the difference between density and mass concentration?
What will be an ideal response?
There are the same in the sense that density is the mass in a particular volume
and this is mass concentration. It may be more common to use density of a pure
substance or a single component and the mass concentration as the resulting
density of a substance in a mixture.
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What happens to Pluto's atmospheric gases over time?
A) Pluto traps gases from other Kuiper Belt Objects, causing its atmosphere to become much, much thicker. B) Pluto does not have an atmosphere. C) Pluto's atmosphere vaporizes over time, due to low gravity in the exosphere. D) Pluto's atmosphere is collapsing gases that freeze and fall to the surface.
The linear momentum of a 100.0 kg object moving around a 30.0 m circle at a constant speed of 2.20 m/s is
a. 0.0 N b. 220 N c. 242 N d. 6600 N
The speed of light in a material is 1.74 × 10^8 m/s. What is the index of refraction of this material?
a. 1.72 b. 0.58 c. 1.74 d. 0.218
How does a permanent magnet work, i.e., what is the explanation of its magnetic effects?
A) Electric charge is permanently separated within the magnet, with positive static charge at one end and negative static charge at the other end of the magnet. B) Electrons orbiting individual atoms in the magnet are all aligned together so that their orbital motion produces a large overall effect. C) The material of the magnet is highly ionized, with one type of ion residing on one end of the magnet and the other type of ion residing on the other end. D) Subatomic particles known as "magnetic poles" are placed on each end of the magnet, with one type of pole placed on one end and the other type on the other end. E) Magnets are a communist plot.