1. Mass number of Lithium-7: 7
Explanation:
- The atomic number of an element is equal to the number of protons inside its nucleus
- The mass number of an element is equal to the number of protons+neutrons inside its nucleus
The nomenclature "Element-X", where X is the number of protons+neutrons, is used to indicate the mass number of the isotope. Therefore, an isotope of LIthium-7 has a mass number of 7.
2. An isotope of lithium-8 contains 5 neutrons
Explanation:
Lithium is the third element of the periodic table, so its atomic number is 3, which means that it has 3 protons.
In this problem, we have an isotope of lithium-8, which means that it has a mass number of 8: so, the sum of neutrons+protons in its nucleus is 8:
where p is the number of protons and n the number of neutrons. However, we also know that for lithium p=3, so we can find the number of neutrons:
The object is moving at a constant speed and towards the point of origin.
<h3>What is the distance time graph?</h3>
The distance time graph is used to show the relationship between the distance covered and the time taken. We know that the slope of the distance time graph is known as the speed of the object.
Given the fact that uniform or constant speed occurs when the distance is changing by equal amounts in equal time intervals, it is clear that is we have a straight line graph, the object is moving at a constant speed.
A good look at the graph as shown implies that the object is moving at a constant speed and towards the point of origin.
Learn more about distance time graph:brainly.com/question/19836052
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Answer:
geothermal energy
Explanation:
the energy is obtained from the heat within the surface of earth
Answer:
T = 5516.63 seconds
Explanation:
Given that,
The International Space Station is orbiting at an altitude of about 370 km above the earth's surface.
Mass of the Earth,
Radius of Earth,
We need to find the period of the International Space Station's orbit. It is a case of Kepler's third law. Its mathematical form is given by :
R = r + h
So, the period of the International Space Station's orbit is 5516.63 seconds.