/sci/ - Science & Math

THIS IS NOT A HOMEWORK THREAD.... of sorts

See, we have this pass paper to do, but she said "dont do question 3, as we have not done that work"

but I want to do it anyway, since I wanna learn more so....

The curve C has the equation y = x^2 - 4x + 7. The point A has coordinates (1,4)

a.) Find the equation of the tangent to C at A

b.) Find the equation of the normal to C at the point A

>>4271741
Damn... we need to bring back the 50s/60s scientist attitude.

We were hardcore in those days.

I hate doing a homework question, and usually I would read a book, ask help ect but I am really confused with this question, I am NOT doing this as an easy way out, I been thinking about the question when Im in the shower ect and I still dont get the answer, maybe Im over thinking it...

In the final stage of the fall, the skydiver is falling through the air at a constant speed. The skydiver kinetic energy does not change even though there is a decrease in the gravitational potential energy. State what happens to this loss of gravitational energy.

Sci, I AM REALLY CONFUSSED!!!!!

we all love this equation:
E = mc^2

However kinetic ENERGY is
E = 1/2mv^2
we chance change that v into a c so kinetic energy is could be written as

E = 1/2mc^2

So how is the half there???

This part of the question concerns half-lives. Remember to show your working for any calculations.
What percentage of a sample of a radioactive isotope remains after two half-lives have passed?
If a rock initially contained 10 milligrams (mg) of a radioactive isotope, how many milligrams of the isotope remain after four half-lives?
If a sample contains 1.56% of its original radioactive isotope, roughly how many half-lives will have passed?
A radioactive isotope has a half-life of 4.5 billion years. What percentage of the original isotope would remain after 6.75 billion years has passed?


get me some university points

if i were to publish a grand unification theory that (in the future) would be experimentally proven, how much money i earn?