When you lift a box up off the floor, you must exert a force at least equal to the weight of the box. If you lift the box at constant speed, you "do work" on the box that would be equal to the force you exert (the weight of the box) times the height through which you lifted the box. If you exert a force of 50 Newtons on the box and lift it 1 meter high, then you did (50 N)x(1 m) or 50 N-m of work on the object. 1 Newton-meter is called a Joule (J), pronounced "jewel." In lifting the 50 N box upward 1 meter at constant speed, you would do 50 Joules of work on the box. That means your body used 50 J of energy to lift the box.
and here is the Equation for Work: Work = Force x distance, or W = F d.
When you lift a box up off the floor, you must exert a force at least equal to the weight of the box. If you lift the box at constant speed, you "do work" on the box that would be equal to the force you exert (the weight of the box) times the height through which you lifted the box. If you exert a force of 50 Newtons on the box and lift it 1 meter high, then you did (50 N)x(1 m) or 50 N-m of work on the object. 1 Newton-meter is called a Joule (J), pronounced "jewel." In lifting the 50 N box upward 1 meter at constant speed, you would do 50 Joules of work on the box. That means your body used 50 J of energy to lift the box.
and here is the Equation for Work: Work = Force x distance, or W = F d.
Natural frequency is a frequency when an object hits a s surface and causes ripples or vibrations or disturbance of their nearby source. An example is throwing a stone to water. When you throw a stone, it creates a wave around the fallen stone. The water is being disturbed by the stone and creates a wave. This is a natural frequency.
Answer:
Interchanging the poles of the magnet
Reversing the direction of the applied current
Explanation:
3. How does an atom differ from a molecule?
4. How do protons, neutrons, and electrons differ?
5. The element lithium (Li) has 3 protons and 3 electrons. The element fluorine (F) has 9 protons and 9 electrons. An atom of the element lithium (Li) transfers an electron to an atom of the element fluorine (F). Which type of bond results between the atoms, and what happens to the charges in each of the atoms?
6. Why do the minerals graphite and diamond look different even though they’re made from the same element, carbon (C)?
Answer:
Explanation:
Answer:
Explanation:
1. Atomic mass of silver:
Atomic mass of an atom is the sum of all the subatomic particles: protons, neutrons and electrons in the atom.
We know that electrons have very negligible mass and the bulk of the mass of an atom is concentrated in the small nucleus which contains protons and neutrons.
Therefore, we can calculate the atomic mass of such element such as Silver by adding the number of Protons and Neutrons together.
Atomic mass = Proton + Neutron
2. Number of electrons = 17
Number of protons = 17
If this atom of chlorine gains an electron more, the number of protons increases by 1 and we then have 18 electrons.
For this atom, it becomes negatively charged as the number of electrons is now greater than that of protons by 1.
3. An atom is the smallest unit of matter that can take part in chemical reaction e.g Na, K etc.
A molecule is a chemical combination of atoms.
Atoms - - - - molecules - - - - matter
4. Protons are positively charged particles in an atom
Neutrons are neutrally charged ie 0 charge
Electrons are negatively charged particles on an atom.
5. We have two elements:
Lithium and fluorine
For chemical combination to occur, there must be gain or loss of electron in such a way that the atom mimics group 8 elements.
Lithium has a configuration of 2,1
It has a valency of 1
The loss of one electron in its outermost shell makes it looks like an helium atom, a noble gas.
Flouirne has a configuration of 2,7
It would require an electron to complete its octet.
The combination Li and F would result into a loss of an electron by Li and it would become psotively charged
Flourine would gain the electron and becomes a posively charged atom.
The compound resulting is LiF: Lithium Fluoride
There is thus a net transfer of electrons. This is an electrovalent bond being created.
6. Graphite and diamond are allotropes of carbon.
Graphite is made up of carbon atoms that are arranged layers on top of one another. They look like sheet.
The carbon atoms on diamond are crosslinked to one another. Each atom bonded to one another in a cubic form.
Answer:
To determine the atomic mass of silver, or any other element, add the number of protons and the number of neutrons together.
If a chlorine atom gains an electron, it will have an unequal number of protons and electrons, which makes it an ion. Because electrons are negatively charged, the ion will be negatively charged, also called an anion.
An atom is the smallest component of an element that retains all of the chemical properties of that element. A molecule is two or more atoms that have bonded together.
Protons and neutrons are found in the nucleus of an atom, while electrons are found in the area surrounding the nucleus of an atom. Protons have a positive charge, electrons have a negative charge, and neutrons have no charge.
Because the lithium atom loses a negatively charged electron, it becomes a positively charged ion, or cation. Because the fluorine gains a negatively charged electron, it becomes a negatively charged ion, or anion. A bond between an anion and a cation is an ionic bond.
Graphite and diamond look different because the carbon atoms bond to one another in different ways in the two minerals. This gives each mineral a unique lattice structure and, as a result, a different physical appearance.
Explanation:
Answer: Foam is a good insulator for two reasons. First, it is filled with gas bubbles; gases conduct heat less effectively than either liquids or solids, and trapping the gas in small bubbles prevents the gas from effectively transferring heat via convection.
Explanation:
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