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Who invented positional notation that would enable them to compute without abacus?
The Indian mathematician Aryabhata is credited with inventing positional notation, which allowed for more advanced computations without the need for an abacus. This system, known as the Hindu-Arabic numeral system, eventually spread to the Arab world and Europe, revolutionizing mathematics and arithmetic.
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When was the hot plate invented?
The hot plate was invented in the early 20th century, around the 1920s. It was developed as a portable alternative for cooking and heating food without requiring a stove.
Why was Robert Hooke's microscope so important for the cell scientists?
Zacharias Jansen invented the microscope. Without it scientists couldn't observe cells.
What is dry bonding?
Re-positional adhesive used mainly in Scrapbooking
Why is it important to have a system of measurement that is based on the units of 10?
The use of base 10 is not as critical to a system of measurement as the use of positional notation. For example, in Roman numerals 1999 is MCCCCCCCCCLXXXXVIIII, which is very cumbersome and does not lend itself to rapid mental calculations. However, base 10 combined with positional notation allows for easy conversion without much effort or memorizing a long list of factors. For example, 1000 mm (39.37 inches) is 1 m (1.094 yards), 1000 m (1094 yards) is 1 km (0.62 miles), while 36 inches (914.4 mm) is 1 yard (0.9144 m), 1760 yd (1609 m) is 1 mile (1.609 km). Also, base 10 measurements allow for easy multiplication. For example, the density of water is 1000 kg per 1000 L or 1000 kg per 1 m³. If you want to know how much one 'cc' (cubic centimeter) of water weights, then it is 0.01 m³ * 0.01 m³ * 0.01 m³ = 0.000001 m³ * 1000 kg = 0.001 kg = 1 g. Whereas, converted from cubic yards to cubic inches to pounds to ounces to drams is 1684.8 * 1/36 * 1/36 * 1/36 * 2.311 * 16 *16 = 21.363911 dram.
How many mill amp hour are in a watt hour?
To convert watt-hours (Wh) to milliamp-hours (mAh), you need to know the voltage of the system in question. You can use the formula mAh = Wh / V * 1000, where V is the voltage in volts.
