gorovogpg
2021-12-14
Answered

The single proton that forms the nucleus of the hydrogen atom has a radius of approximately $1.0\times {10}^{-13}$ cm. The hydrogen atom itself has a radius of approximately $52.9\pm$ . What fraction of the space within the atom is occupied by the nucleus?

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asked 2021-02-21

A small block with mass m is placed inside an inverted conethat is rotating about a vertical axis such that the time for onerevolution of the cone is T. the walls of the cone make an angle Bwith the vertical. The coefficient of static friction betweenthe block and the cone is ?. Draw a free body diagram.If the block is to remain a constant height h above the apex of thecone, what are the maximum and minimum values of T?

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Force F = (2.0 N) i - (3.0 N) k acts on a pebble with positionvector
r = (O.50 m) j - (2.0 m) k, relative to the origin. What isthe resulting torque acting on the pebble about

a.) the origin and

b.) a point with coordinates (2.0 m, 0, - 3.0 m)?

a.) the origin and

b.) a point with coordinates (2.0 m, 0, - 3.0 m)?

asked 2021-02-09

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The lowest frequency available on a radio's AM dial is 570kHz. What is the wavelength of this light?

asked 2021-12-04

In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find the probability distribution associated with these data. (Enter your answers to four decimal places.)
$$\begin{array}{|ccc|}\hline \text{Years Car Is Kept, x}& Respondents& Probability\\ 0\le x<1& 55\\ 1\le x<3& 430\\ 3\le x<5& 315\\ 5\le x<7& 345\\ 7\le x<10& 245\\ 10\le x& 610\\ \hline\end{array}$$
What is the probability that an automobile owner selected at random from those surveyed plans to keep his or her present car:
(a) Less than five years?
(b) 3 years or more?In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find the probability distribution associated with these data. (Enter your answers to four decimal places.)
$$\begin{array}{|ccc|}\hline \text{Years Car Is Kept, x}& Respondents& Probability\\ 0\le x<1& 55\\ 1\le x<3& 430\\ 3\le x<5& 315\\ 5\le x<7& 345\\ 7\le x<10& 245\\ 10\le x& 610\\ \hline\end{array}$$
What is the probability that an automobile owner selected at random from those surveyed plans to keep his or her present car:
(a) Less than five years?
(b) 3 years or more?

asked 2021-11-08

Find the length and width of a rectangle that has the given area and a minimum perimeter. Area: 49 square feet