Tuesday
December 10, 2013

# Posts by walter

Total # Posts: 73

modern physics - relativity
A photon of energy E collides with a stationary particle of rest mass m0 and is absorbed by it . (A) what is the velocity of resulting composite particle ? (B) What is the mass of the resulting composite particle ? use conservasion of energy / momentum please show working

relativity
Show that the following process is dynamically inpossible: A single photon in empty space is transformed into an electron and a positron, each with rest mass m(e).Explain in detail, How can this this process be made possible? In this case, what is the minimum photon energy req...

relativity
A particle called neutral pi meson (or pion) decays into two photons (and nothing else).If the pion (whose rest mass is 135Mev) is initially at rest, What are the energies of the photons? How are they moving with respect to each other ?

Life orientation
Environmental problem

Basic Math
1/4 = 15/60 1/5 = 12/60 What do you think?

Basic Math
Okay, Now that the common demoninator is 60, I now multiply. But where do I start? for example, I just leave the 1 alone because its a whole number. So now I multiply the 1/2 to 1 * 30 = 30 and 2 * 30 = 60 Do I do the same for the 1/3 and so on?

Basic Math
I need help adding fractions with different denominators. Here is the problem... 1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 I can see that the demoninators increase. Since they are both addition and subtraction, how do I do this problem? Thanks, Walter, New York.

math
the lengths of corresponding sides of similar rectangles have a ratio of 7:4 the perimeter of the smaller rectangle is 80 ft. what is the peremiter of the larger rectangle?

science
You are designing a scale model of the solar system mercury it is 4,878 km in diameter.using the following scale factor, how large does your model of mercury need to be? A. 160cm B. 16cm C.146cm D.30cm

Math
it has a 4 added to it every time. but it just doesnt sound right because 4+4 is 8 not 44 so what other word can i use? * sorry its *going and *each and d) is like 1*2=2, 2*3=6, 6*7=42, 42*43=1806, 1806*1807=3263442 but i do not know how to put it into words.

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