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Science

The observation, identification, description, experimental investigation, and theoretical explanation of phenomena is all part of science. Nothing is immune to the scientific process: from charm quarks that haven't existed naturally since the beginning of time to Pluto, recently demoted from planet to dwarf planet. Questions on knowledge about the material and physical aspects of our world are asked and answered here.

203,801 Questions

What quantity is used to measure matter?

The mole. It is defined as the number of molecules that are in 12 grams of carbon-12, which is roughly equal to the Avogadro constant 6.02214179×10²³.

Since the force of gravity is proportional to the mass of an object, the weight of an object can be used as measure of the matter it contains..

How many rotations per second would an object that's 151045 miles in diameter produce if it was rotating at 30000000 miles per hour?

If traveling at 30,000,000 mph over a radius of 151.045/2 = 75,522.5 miles the rotational velocity is 30000000/75522.5 = 397.23 radians per hour. Since a rotation is 2 pi radians, that is 63.22 revolutions per hour, or 0.0176 rotations per second

InWhich year the symbol 0 is introduced?

Although the origin of zero is controversial, some historians believe that it was invented by the Babylonians in about 500 BCE. In the sixth century, it was discovered by the Hindus and Chinese, and 700 years later, it reached the Western world via the Arabs. Zero is the only integer (whole number) that is neither positive nor negative. In a sense, zero makes negative numbers possible, as a negative number added to its positive counterpart always equals zero. When zero is added to or subtracted from a number, it leaves the number at its original value. Zero is essential as a position holder in the system known as positional notation. In the number 203, for example, there are two hundreds, zero tens, and three ones. Zero indicates that the value of the tens place is zero. In the number 1024, zero indicates that the value of the hundreds place is zero. Scientists use the term absolute zero (0° Kelvin) to refer to the (unattainable) theoretically lowest possible temperature, at which the kinetic energy of molecules is zero.

Would the current of a light bulb be greater or less than when first turned on?

incandscent light bulbs voltage is 120 wattage is100 light output is 1560 lumens,use resistance as a function of temperature

Loss of weight of an object in water is equal to weight of the displaced water what is this law?

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When is a zero not signifigant?

Suppose we have to write 370 in the scientific way. Then we write the same as 3.7 x 102

Here we have dropped 0 as it is no more significant.

But if we do write as 3.70 x 102 then the place is to be there for an accuracy.

The value may vary as 3.73 x 102 with an accuracy.

Is four fifths larger than a whole?

No, four fifths is not larger than a whole. A whole is one, and 4/5ths is 4 parts out of 5, or 1 part out of 5 lessthan 1.

What is the most reasonable unit for a cylinder?

A cylinder can refer to a grain silo or a tiny pellet. A reasonable unit for one will not be reasonable for the other!

What is the nth term for -3052?

A single number, such as -3052 cannot define a sequence and, without a sequence you cannot have an nth term.