Recent content by anotherperson

so if i use these values (changing the units of course) is this correct di=7.7mm do=300m hi=24.0mm ho=20.0m and then using the magnification i get i can work out the size of the tree?

but i don't know the focal length...

Homework Statement A man looks at a tree of height 20.0m a distance of 300m away. the cornea has a radius of curvature of 7.7mm, eye has refractive index of 1.47 and the length of the eye is 24.0mm. Calculate the size of the image of the tree on the man's retina. Homework Equations...

Homework Statement 68kg bungee jumper standing on a 46m platform above the ground. The bungee cord has no effect for 9m(ie natural cord length is 9m) when the bungee jumper is more than 9m away the spring constant is k=66N/m a)what is his speed after falling 9m from the platform...

yep, thanks!

thanks!

thanks!

so the frictional force act to the right(up the incline) what is the oposing force, acting right? the force of gravity? if so what is the force pulling the block down as in the opposing force to the normal?

so in reference to this question is should be 20 and -15?

Homework Statement Bird A and B are flying towards each other Bird B at 20m/s Bird A at 15m/s and screeches with a frequency of 3200 Hz what does bird B perceive? Homework Equations the speed of sound is 343m/s Fobserver==Fsource((vsound+vobserver)/(vsound+vsource) The Attempt...

i just want to double check this is right because i am not given answers. i have a wave traveling at 5cm/s traveling in the positive x direction. when t=0 it has intercepts at 1cm and 4cm. if i have to draw the graph at t=2 will the graph look exactly the same except the intercepts are at...

sin32=nsin21 just writing it here so i remember when i come back

thanks for your help!

when vi=c do you make it sinangle=nsinangle and solve for n?