Friday
October 24, 2014

Posts by Ri


Total # Posts: 13

Math
The bookseller sells packages of 15 pens each and 12 pencils each.they want the same number of pens and pencils in their next order.find the smallest number of packages
October 5, 2014

Education
In studies involving children, the ____ should have the final word in deciding whether they should participate. A. Children B. Researchers C. Therapists D. Parents I think it is either B or D. I am conflicted because parents would have already agreed to letting their child ...
November 12, 2012

Education
Dr. Muse, a sociocultural theorist, speculates that children's ability to reminisce about the past can be promoted through adult teaching. This is an example of a A. Theory B. Research Question C. Hypothesis D. Research method I have read my book, but haven't found any...
November 12, 2012

Education
You are right, it is B. Even though it focuses in children's cognitive and social decelopment, the study is to understand constancy and change from conception through adolescence, so it is not limited to C. Thank you!
November 12, 2012

Education
Which of the following statements about the field of child development is correct? A. It’s devoted to understanding human constancy and change over the lifespan. B. It’s part of a larger, interdisciplinary field known as developmental science. C. It focuses primarily...
November 12, 2012

Physics
Consider a “semi-infinite” nonconducting rod (that extends infinitely to the right only) and has a uniform charge density. Calculate the magnitude and direction of the electric field at the point, P, which is a distance of R away from the edge of the rod. Does the ...
November 24, 2010

Physics
As a comet swings around the Sun, ice on the comet's surface vaporizes, releasing trapped dust particles and ions. The ions, because they are electrically charged, are forced by the electrically charged solar wind into a straight ion trail that points radially away from ...
November 24, 2010

Physics
An electric generator contains a coil of 100 turns of wire, each turn forming a rectangular loop 50cm by 30cm. The coil is placed entirely in a uniform magnetic field with magnitude, B = 3.5T and direction initially perpendicular to the coil's plane. What is the maximum ...
November 24, 2010

Physics
In a certain cyclotron a proton moves in a circle of radius 0.5m. The magnitude of the magnetic field is 1.2T. a) What is the oscillator frequency? b) What is the final kinetic energy of the proton?
November 24, 2010

Physics
2) A solid nonconducting sphere of radius R = 5.6cm has a nonuniform charge distribution or volume charge density p= (1.41pCm^-3)r/R, where r is the radial distance from the sphere's center. a) What is the sphere's total charge? b) Calculate AND sketch a graph of E ...
November 24, 2010

Physics
Near the equator, the Earth's magnetic field point almost horizontally to the north and has a magnitude of B = 50 micro T. What should be the magnitude and direction for the velocity of an electron if its weight is to be exactly balanced by the magnetic force?
November 16, 2010

Physics
You decide to build a cyclotron (because you are bored) that will accelerate protons to 10% of the speed of light. The largest vacuum chamber you can find is 50cm in diameter. What magnetic field strength will you need?
November 12, 2010

math
A,B,C, and D are sitting along one side of a table. In how many different orders could the four friends be sitting?
June 8, 2009

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