Homework Statement
The Shortest distance from the curve xy=4 to the origin is:
A. 2
B. 4
C. rad (2)
D. 2* rad (2)
E. .5 rad(2)
Homework Equations
... distance equation?
The Attempt at a Solution
i used the pythagorean theorem to find the distances using x^2 and y^2 as a^2...
Homework Statement
If dy/dx=xy^2 and x=1 when y=1, then y=
(A) x^2
(B) -2/(x^2 -3)
(C) x^2 + 3
(D) 2/(x^2 +1)
(E) (x^2 -3)/2
Homework Equations
The Attempt at a Solution
dy/dx=xy^2
dy=xy^2dx
dy/y^2=x dx
∫dy/y^2=∫x dx
-1/y = x^2/2 + C
y=-2/x^2 + C
1=-2/1^2 + C
C=3...
Homework Statement
the maximum wavelegnth for which an electromagnetic wave can eject electrons from a platinum surface is 196 nm. when radiation with a wavelength 141 nm shines on the surface, what is the max speed of the ejected electrons?
Homework Equations
f=c/λ
E=hf
E=Φ+K
Φ=hf0...
Homework Statement
in the line spectrum of atomic hydrogen there is also a group of lines known as the pfund series. these lines are produced when the electrons, excited to high energy levels, make transitions to the n=5 level.
Determine (a) the longest wavelength and the (b) shortest...