Category: Physics

Why are pencils so cheap? “If graphite is so expensive then how come pencils are so cheap?” Because the graphite core (commonly called “lead”, though it contains no lead at all) is not high-grade pure graphite, it is very inexpensive. Is graphite used in batteries? Graphite materials remain the dominant active anode material used in […]

How much did a covered wagon cost in the 1800s? It was costly—as much as $1,000 for a family of four. That fee included a wagon at about $100. Usually four or six animals had to pull the wagon. Oxen were slower, but held up better than horses or mules. What type of animal was […]

How much force can a hydraulic press produce? In case the pressure gauge reads 1000 PSI, the 1000 pounds per square inch is applied to 10 square inches. If every square inch of the surface area applies 1000 pounds of force, the 10 square inches will exert a total of 10,000 pounds of force. What […]

What is the formula of urine? On an elemental level, human urine contains 6.87 g/L carbon, 8.12 g/L nitrogen, 8.25 g/L oxygen, and 1.51 g/L hydrogen. The exact proportions vary with individuals and with factors such as diet and health. In healthy persons, urine contains very little protein and an excess is suggestive of illness. […]

What three colors are the primary colors of light? See what happens when you mix together the three primary colors of light: red, green and blue. How do you make primary colors? You can use the primary colors (red, blue, and yellow) plus black and white to get all of the colors of the rainbow. […]

Which force would cause an object to fall? gravity How do you find the G force of a dropped object? g-Force = Height / StopDist. Can you fall out of a water slide? It’s the water running down the slide, creating an almost frictionless surface, that makes this possible, Van Buren said. Weightlessness is achieved […]

Is density directly proportional to pressure? Density is directly proportional to pressure and indirectly proportional to temperature. As pressure increases, with temperature constant, density increases. What does pressure equal to? Pressure (p) is defined as the normal force F per unit area A over which the force is applied, or. p=FA. p = F A […]

How many calories can you burn with cardio kickboxing per hour? Fitness experts note that you can burn upwards of 900 calories for every hour of kickboxing. According to Harvard Health, a 125 pound person will burn 300 calories in 30 minutes of straight kickboxing, whereas a person who weighs 185 pounds will burn 444 […]

What is the oldest breed of dog? 8 Oldest Dog Breeds in The World Chow Chow. Year: Circa 150 – 200 B.C. Chinese Shar Pei. Year: Circa 206 B.C. Saluki. Year: Circa 329 B.C. Samoyed. Year: 1000 B.C. Alaskan Malamute. Year: Circa 1000 B.C. Afghan Hound. Year: Circa 6,000 B.C. Basenji. Year: Circa 6000 B.C. […]

What happens when two pure substances are mixed? If we take two or more pure substances and mix them together, we refer to this as a mixture. Mixtures can always be separated again into component pure substances, because bonding among the atoms of the constituent substances does not occur in a mixture. What most commonly […]