• Class 11 Physics Demo

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• general science question and answers

Question:A beaker of water contains 300 mL of water. (1liter = 1000 cm^3). What is the volume of water in m^3? What is 28.84 m divided by 6.2 s with the correct number of significant figures?

Answers:Volume: 300 ml is 300 cm^3 300cm^3 is 3 x 10^-4 m^3 as [(3 x 10^2)/(100 x 100 x 100)] = 3 x 10^-4 Speed: 28.84/6.2 = 4.6516... =4.7m/s (only 2 s.f as only 2 in 6.2) When giving the correct number of significant figures, you should always give the answer to the same number as the least given. This is because after the significant figure, there could be any number which would still round to 6.2 in this case (eg 6.15, 6.18357, 6.249). This means that you cannot be any more accurate than the same number of significant figures, and adding more places in your answer will add error and mean that your answer is no longer likely to be correct, whereas it was before (if not very accurate)

Question:1. Explain how we hear sounds. 2. Describe how the meaning of sound is related to frequency and time. 3. Compare light and sound waves. 4. Describe the properties of light:describe light as both a wave and a particle. 5. Compare the speed of light with the speed of sound? 6. Explain the reason behind color blindness. Be sure to give accurated educational answers cause this is for my project. I do not have the time to read for all of the answer.

Answers:The answers you are looking for will take an enormous amount of time to answer. Each one would take thousands of volumes of books. I'm sorry I do not have the time to write the necessary answers.... e.g wave/particle duality is a vast subject!!

Question:Consider a particle moving in a straight line from initial point B to final point A, acted upon by a constant force F. (Part A figure) The force (think of it as a field, having a magnitude and direction at every position r ) is indicated by a series of identical vectors pointing to the left, parallel to the horizontal axis. The vectors are all identical only because the force is constant along the path. The magnitude of the force is F, and the displacement vector from point B to point A is L (of magnitude L, making and angle theta(radians) with the positive x axis). Find W(BA) , the work that the force F performs on the particle as it moves from point B to point A. Express the work in terms of L, F, and theta(angle). Remember to use radians, not degrees, for any angles that appear in your answer. the homework is online I put the answer: F*L and F*Lcos(theta) but computer says its wrong part a figur is a bent vector to the left from point B to A with theta between them and the x-axis (this is the best I can do to describe its simply just a vector)