Top answers

what depends if the universe is expanding or not

H, (see Hubble's Law)
HZ
Answered by Huairen Z. • Physics tutor
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How would I write the binary number 11001 in decimal form?

Answer: 25. Explanation: In the binary system, each digit can be one of two values: 0 and 1. That's two possibilities ('bi' is Latin for 'twice'). In the decimal system, each digit can take any value from 0 ...
KG
Answered by Katrina G. • Physics tutor
50303 Views

What is the difference between nuclear fission and fusion?

Nuclear fission is the process that splits an atom nucleus apart and release energy. Normally a neutron is struck against an atomic nuclei and splits it into two smaller nuclei, releasing two or three neutro...
SL
Answered by Suellen L. • Physics tutor
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In a doppler shift why does a moving source show no increase in speed of the mechanical waves emitted?

I'll first ask the student to explain the difference between a moving source and moving observer, prompting them until they get something like this(asking them to draw a diagram if needed)- When the observer...
JG
Answered by James G. • Physics tutor
2623 Views

A wire has length l, cross-sectional area a, resistivity p and resistance R. It is compressed to a third of its original length but its volume and resistivity are constant. Show its new resistance is R/9.

First realize if its length is now l/3 but its volume is constant its cross sectional area is 3a. Substitute those into the equation for resistance R=p(l/a) and you get (1/9)(p(l/a))= R/9
TD
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