Category: Physics

Is friction necessary for a body to roll? Yes friction is necessary to the body to roll. The minimum friction is that when the body moves easily by using 1 Newton of force. How is the draft calculated in rolling? Explanation: During rolling process, the workpiece gets squeezed, causing the thickness of the workpiece to […]

Is rock a fossil? Fossils are the preserved remains, or traces of remains, of ancient organisms. Fossils are not the remains of the organism itself! They are rocks. Bones, shells, feathers, and leaves can all become fossils. Who is the most famous paleontologist in the world? Jack Horner Do you need a PhD to be […]

How are amino acid sequences used to figure out if two species are closely related? Molecular clocks are used to determine how closely two species are related by calculating the number of differences between the species’ DNA sequences or amino acid sequences. These clocks are sometimes called gene clocks or evolutionary clocks. What are the […]

Is there anything more powerful than gamma rays? The measurement is exceedingly difficult since cosmic rays can outnumber gamma-rays at these energies by a factor of 10,000 to 1 or more! As the gamma-ray is making its way to our telescopes, it has to traverse through space, where there are photons and particles all around […]

Is EMF sensitivity a real thing? Electromagnetic hypersensitivity (EHS) is a claimed sensitivity to electromagnetic fields, to which negative symptoms are attributed. EHS has no scientific basis and is not a recognised medical diagnosis. Does electromagnetic waves effect on human body? The main effect of radiofrequency electromagnetic fields is heating of body tissues. Despite extensive […]

Are nitriles always at the end? nitrile shows a -CN group at the end of the chain. As with the previous examples involving acids and acid derivatives, don’t forget that the carbon in the -CN group counts as part of the chain. The old name for this would have been methyl cyanide. How do you […]

What happens to the volume of a gas when you double the number of moles of gas? Le Chatelier’s Principle states that: a) When a system at equilibrium is disturbed , a new equilibrium constant is established. What happens to the volume of gas when you double the number of moles of gas while keeping […]

What is the percentage error in the surface area of a sphere? SΔS=r2Δr=2×4=8% Was this answer helpful? What is percentage error in sphere? Volume of the sphere is V=43πr3. As per the rule for combination of errors for exponents ΔVV=3Δrr. =3 x 0.015. ΔVV=0.045. Percentage error =ΔVV×100=0.045×100=4.5% What is the error in volume? To calculate […]

How do valence electrons affect properties? The number of electrons in an atom’s outermost valence shell governs its chemical properties. Elements react to form a closed shell, corresponding to the electron configuration s2p6 . This tendency is called the octet rule, because the atoms have eight valence electrons. Do valence electrons determine physical properties? Electrons […]

Which component of skill-related fitness would most help a shot putter increase the distance of their throw? power What factors need to be considered when one is designing a resistance training program? What are the seven aspects to consider when designing a resistance training program? Needs analysis, exercise selection, training frequency, exercise order, training load […]