Is a pencil chemical change?

Is a pencil chemical change? When you sharpen your pencil, you have only caused a physical change. The sharpener has cut off some of the wood and maybe also some of the graphite, but the atoms of the wood and graphite have not changed chemically. Is snow a physical or chemical change? When rain turns […]

What do bacteria use for movement?

What do bacteria use for movement? flagellum What are two foods that bacteria help make? Bacteria are used to make food, such as cheese and yogurt, and they can also help us break down harmful substances in the environment. Scientists created a type of bacteria that could gobble up oil from oil spills. What are […]

What 3 things affect the speed of sound?

What 3 things affect the speed of sound? Factors Affecting The Speed of Sound The Density of Medium: Sound requires a medium to travel. The density of the medium is among the factors which affect the speed of sound. The Temperature of The Medium: Higher the temperature, the higher is the speed of sound in […]

When did the church admit the Earth was round?

When did the church admit the Earth was round? 1633 When was Heliocentrism finally accepted? It was not until the 16th century that a mathematical model of a heliocentric system was presented, by the Renaissance mathematician, astronomer, and Catholic cleric Nicolaus Copernicus, leading to the Copernican Revolution. Did the Catholic Church accept the heliocentric theory? […]

Does cold water help hurricanes?

Does cold water help hurricanes? Once they move over cold water or over land and lose touch with the hot water that powers them, these storms weaken and break apart. Recent studies have shown a link between ocean surface temperatures and tropical storm intensity – warmer waters fuel more energetic storms. What weakens a hurricane? […]

What is the force of the earth on the moon?

What is the force of the earth on the moon? Sun, Earth, and Moon Gravitational body causing tidal force Tidal force Body Mass (m) Moon 7.34×1022 kg 1.10×10−6 m⋅s−2 Earth 5.97×1024 kg 2.44×10−5 m⋅s−2 m is mass; r is radius; d is distance; 2r is the diameter G is the gravitational constant = 6.674×10−11 m3⋅kg−1⋅s−2 […]

What is Parallax give an everyday example?

What is Parallax give an everyday example? The term “parallax” refers to the apparent movement of objects when viewed from different positions. The everyday example of this is seen driving on the highway– when you look out the window, electrical poles near the road seem to zoom past, while trees in the distance appear to […]

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