An atomic mass unit is equal to
2 answers:
Answer: c. one-twelfth the mass of a carbon-12 atom.
Explanation: An atomic mass unit ( amu) is defined as of the mass of an atom of carbon with mass number 12 , which is the most abundant isotope of carbon. Thus the carbon-12 atom has six protons and six neutrons in its nucleus.
1 amu is approximately equal to or
. The mass of an atom in amu is roughly equal to the sum of the number of protons and neutrons in the nucleus.
amu is used to differentiate between isotopes as they would have different mass.
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Answer:
E. Zero Maximum
Explanation:
At the point of maximum displacement, the speed is zero while the restoring force is maximum. In fact:
- The restoring force is given by , where k is the spring constant and x is the displacement - at the point of maximum displacement, x is maximum, so F is maximum as well
- the total energy of the system is sum of kinetic energy and elastic potential energy:
where m is the mass of the system and v is the speed. Since E (the total energy) is constant due to the law of conservation of energy, we have that when K increases, U decreases, and viceversa. As a result, when x increases, v decreases, and viceversa. At the point of maximum displacement, x is maximum, so v will have its minimum value (which is zero, since the system is changing direction of motion).