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# definition magnitude physics

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Question:i know its the "amount" of something, but i dont get it. if you would like to help me with the problem and explain the whole magnitude thing to me that would be great A particle had a velocity of 19 m/s and 3.0 s later its velocity was 32 m/s in the opposite direction. What were the magnitude and direction of the average acceleration of the particle during this 3.0 s interval? __________m/s2 a. in the initial direction of motion b. opposite the initial direction of motion c. direction changes continuously

Answers:Strictly speaking, magnitude is the "amount" associated with a vector; the vector stripped of any information about its direction. Graphically, a vector is represented by an arrow, defining the direction, and the length of the arrow defines the vector's magnitude. I would recommend you view the information on vectors cited below and then reexamine your problem. I believe you will then be able to solve the question with little difficulty.

Question:A 9th grade text-book says Quote Physical quantity = M * 10^n where M is a number number greater than 1, but less than 10, and n is a positive or negative integer. The power of ten ( ie 10^n) is called the order of magnitude of the physical quantity and M is called its numerical value. If M = 3.2, it can be written as 10^0.5 which when rounded becomes 10^1. Hence if M < 3.2, the power of 10 will be less than 0.5, so the order of magnitude remains 10^n, but if M>=3.2, the power of 10 will be 0.5 or more than 0.5, so the order of magnitude becomes 10^(n+1). Unqoute Is this correct? What I thought was, order was n if the physical quantity was expressed in the form M * 10^n and 1 <= M < 10

Answers:Order of magnitude is merely a means of comparing numbers with large scale differences. 3.2 will be considered to have order of magnitude 0. 32 has order of magnitude 1. 3.2 * 10^5 has order of magnitude 5. There are differences in jargon between engineers and mathematicians. For example, 456 has order of magnitude 2. An engineer might say that 456 is in the order of 10^2.

Question:Electric Trains can maintain a constant speed of 80 km/h throughout a trip. What is the order of magnitude for this? A. 10^-2 B. 10^1 C. 10^2 D. 10^4 I always choose best answer.

Answers:80 km/h is closer to 100 km/hr than any of the other choices. so answer = C. the wikipedia entry provides a mathematical formulation for this quantity, but i can tell you that in practice in physics - it is typically used more often not as the exponent of the truncation of the log of the number (as the wiki definition implies), but as the exponent of the nearest integer of the log of the number. i.e. the exp(rounded off value of logarithm of the number). i.e. log10(80) = 1.9, which rounds to 2, and 10^(2) = 100 you might want to check your textbook or w/ the teacher to see which definition is preferred. the definition i described is the one used by practicing physicists. if this is a math class then you might need to use the other definition. cheers

Question:i don't really understand order of magnitude, can you please explain it to me? ex. 1. 3.21x10^9 2. 4.99x10^5 3. 11,000 4. 1.25x10^-4 what are the orders of magnitude of these examples?

Answers:Order of magnitude is the largest power of 10 in the number. When the number is written in scientific notation, the order of magnitude is the exponent. So write all the numbers below in scientific notation. 1. 3.21x10^9 2. 4.99x10^5 3. 11,000 = 1.1000 * 10^4 4. 1.25x10^-4 1. 9 2. 5 3. 4 4. -4