Category: Physics

How did Annie Jump Cannon lose her hearing? Cannon was a child she had a cold. The cold caused Ms. Cannon to become deaf. Every year she could hear less and less until she couldn t hear anymore. How old was Annie Jump Cannon when she died? 77 years (1863–1941) When did Annie Jump Cannon go […]

What is the H word slang? h-word (plural h-words) (euphemistic) The word hell/Hell. What is an H? (H) is an emoticon which means means “Cool Dude” or “Heart.” This emoticon may be typed as (H), but is more commonly typed as (h). What is the sound of H? How to pronounce the H sound. H […]

Why should we never touch a birds nest? Songbirds like this warbler have no sense of smell and will not abandon a nest because of the smell of humans. However, if you do inadvertently happen to touch a bird’s egg or nest, rest assured that your scent alone won’t cause the parents to flee. What […]

How do you calculate pressure from temperature? Use the formula: k = T1/P1. For example, if a gas at an initial temperature of 300 K and an initial pressure of 100 Pa, drops by 50 Pa, the proportionality constant k = 3 K/Pa = 300/100 = T1/P1. Multiply the drop in pressure by the proportionality […]

Who invented ak47? Mikhail Kalashnikov What country invented guns? China How are guns named? Most manufacturers “name” their guns by model number. The Smith and Wesson Model 19, for example, was the most popular police revolver in the 1960s and 1970s. Most other firearms have similar model numbers, sometimes co-branded with trade names. Do soldiers […]

How do ripples form water? When you throw a rock into a river, it pushes water out of the way, making a ripple that moves away from where it landed. As the rock falls deeper into the river, the water near the surface rushes back to fill in the space it left behind. How do […]

How do you calculate natural frequency of a pipe? fn = natural frequency of the pipe (Hz) E = Young’s modulus of elasticity (200 GPa or 30E6 psi for steel – approximately but close enough) Pipe OD = 323.8 mm. Pipe ID = 288.84 mm. f is the frequency (Hz) D is the diameter of […]

What is the value of N in PV nRT? This law combines the relationships between p, V, T and mass, and gives a number to the constant! The ideal gas law is: pV = nRT, where n is the number of moles, and R is universal gas constant. The value of R depends on the […]

Can I use a 50 Hz device in a 60 Hz power frequency? Electrical machines designed for 50Hz can usually work safely in 60Hz power supply, but not applicable to 60Hz machines to be run in 50Hz power supply. It is not always easy to just change the machine or equipment to rated frequency considering […]

How do electrons act like waves? Students will know that electrons carry energy and momentum when they are moving. Yet these moving electrons seem to be guided to an interference pattern just like waves of light; or just like photons of light in the micro-physical world. The particles are guided by ‘matter waves’. … Why […]