Thursday
December 5, 2013

# Posts by Marissa

Total # Posts: 239

Physics
Microwaves with λ = 1 mm are incident upon a 10 cm slit. At a distance of 1 m from the slit, what is the width of the slit's image? The answer is supposed to be 10 cm. I can't seem to get that though. Can someone explain?

algebra
how many quarts of pineapple juice should Theo add to a 20% pineapple drink to create 5 quarts of a 50% pineapple juice mixture?

math
you subtract 25 from each side of the equation to get 3x=45. then you divide each side by 3 to get x=15. your just undoing the math

Physics
It's an experiment. In Part 2.2.4 of the experiment, some light that reflects off the apparatus or from neighboring stations strikes the photometer even when the direct beam is blocked. In addition, due to electronic drifts, the photometer does not generally read 0.0 mV ev...

Physics
A bothersome feature of many physical measurements is the presence of a background signal (commonly called "noise"). It is necessary, therefore, to subtract off this background level from the data to obtain a valid measurement. Suppose the measured background level i...

How many different four-digit numbers can you make from the digits 1,2,3, and 4 if each digit is used only once?

Physics
so, q is the elementary charge times 2, and Q is the charge of lead? what is that? and thanks, the concepts are much clearer.

Physics
Here's the question I'm currently working on... What initial kinetic energy must an α particle have if it is to approach a stationary lead nucleus to within a distance of 35.9 fm? So I looked up a couple of things I thought we need for this problem. I have the ato...

Physics
wait, aren't we lookng for the mass, too?

Physics
OK, so I'm having some serious problems with this one question. It's on relativity. Here it is: Calculate the mass of a proton (m0 = 1.67E-27 kg) whose kinetic energy is one sixth its total energy. How fast is it traveling? THANKS!!

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