Category: Physics

At what height will surface tension kill you? Falling into water from about 245 ft. will be fatal for most people. The fatal results can vary from person to person and there are known cases of people dying from heights less than 200 ft. Do you have to break the surface tension of water? The […]

What does infectivity mean? : the ability to produce or transmit infection : the quality or state of being infective The onset of cough on the second day of illness in this patient, followed by clinical evidence of pneumonia four days later, raised the question of his infectivity during the four days before hospitalization.— What […]

Which plants disperse their seeds by wind? Wind dispersal Seeds from plants like dandelions, swan plants and cottonwood trees are light and have feathery bristles and can be carried long distances by the wind. Some plants, like kauri and maple trees, have ‘winged’ seeds. What are the 5 types of seed dispersal? There are five […]

Are a pair of scissors a compound machine? A pair of scissors is a compound simple machine that uses levers to force wedges (scissors blades) onto something to cut it. Many machines have many simple machines as parts of them. Is a wheel and axle a compound machine? A compound machine is a machine that […]

How reflected light can be reflected again? Reflected Light can be Reflected Again When two mirrors are placed opposite to each other, the first mirror reflects light that falls on its surface. The periscope makes use of this concept by using two plane mirrors. Periscopes are used in submarines, tanks and also by soldiers in […]

Which of the following will be the same for all orbitals in a given subshell? Explanation: The quantum numbers that are used in the identification of an electron are n, l, m, and s. All the orbitals in a given subshell have the same value of n(principle quantum number) and l( azimuthal quantum number). What […]

Is it 1 degree or 1 degrees? 1 is a singular unit, so at 1 degree you are one unit above your zero point. You can have 1 or -1 degree outside. Anything else should be plural. I would say 1 degrees is correct. What’s the coldest temperature a human can survive? 32 degrees Fahrenheit […]

How long does it take for iron to rust in salt water? it will start almost immediately, and may progress at a rate of around 1/2mm per year. This rate will vary depending on the alloy and water conditions. How do you speed up the rusting process? Direct sunlight helps speed up the rusting process. […]

What is the importance of water for living beings? Living organisms need water to survive. All oxygen-dependent organisms need water to aid in the respiration process. Some organisms, such as fish, can only breathe in water. Other organisms require water to break down food molecules or generate energy during the respiration process. What role does […]

How do we release the energy stored in fossil fuels? All the energy in oil, gas, and coal originally came from the sun, captured through photosynthesis. In the same way that we burn wood to release energy that trees capture from the sun, we burn fossil fuels to release the energy that ancient plants captured […]