Lorry

Hi,I need help with question 1) There were twins on our planet earth. They were physicst. One of them were sent to space at his 20 year. When he comes back after 20 years of stay in the space he was 40 years but his brother who stayed on earth was 60 year...

1) Let f(x)=9x-2;g(x)=under square root 3x+7. Find each of the following. A) domain of (f+g) B) domain of fg C) domain of f/g (my answer is all r real number am i right?) 2) Let f(x)=3x-2;g(x)=5x+1. Compute the indicated value. A) (fogof)(2) i don't get t...

Please help i don't get the answer. How much energy, in kilojoules per mole, is released when an electron makes a transition from n=5 to n=2 in an hydrogen atom?

How can I calculate the energy required for the ionization of an electron from the ground state of the hydrogen atom?

What are the reasons for the olympic games to be largest of all sporting events?

Find the unit vector perpendicular for the vector i+2j-4k in the xy-plane.

Thank you

Thank you:-)

But how you do it?please please explain it to me.

Wave length=speed of light/frequecy (speed of light=3x10^8) (answer 0.000000000122nm)

It is not=0. Please help me!