Recent content by agentlee

Homework Statement So if light travels from vacuum to oil to water (1 -> 1.4 -> 1.33) how do you know if there is a constructive or destructive interference? Homework Equations The Attempt at a Solution I know that when it goes from air to the oil there is a phase shift of 1/2...

Homework Statement A 2.25g bullet embeds itsself in a 1.50kg block, which is attached to a spring of force constant 785N/m. If the max compression of the spring is 5.88cm, find the initial speed of the bullet and the time for the bullet block system to come to rest. The speed comes out to...

Homework Statement A block has a density of 8.90 g/cm^3 and has an apparent mass of 120g in water and 116g when submerged in a liquid. What is the density of the liquid?Homework Equations m/(m-mapparent) = p/pliquidThe Attempt at a Solution Nevermind.

Just x. I ended up getting 23225331.66m using that proportion

Mass of Mercury/x^2 = Mass of Sun/(distance from Mercury and Sun - x)^2 Where x is the distance I'm trying to find

Here's what I have so far... Mm/x^2 = Ms/(d-x)^2

Ms - x ?

Homework Statement Find the point between Mercury and the sun at which an object can be placed so that the net gravitational force exerted by Mercury and the sun on this object is 0. Homework Equations Mass of sun = 1.991 x 10^30kg Mass of Mercury = 3.18 x 10^23kg distance between...

Oh wow...The weight's at halfway and the plank is at 1.5m so 2-1.5...wow lol Thanks for your help :D

I see what you mean now, okay. So through a valiant use of process of elimination, the second sawhorse

Where the cat is positioned?

I forgot to mention they labeled F1=0, so that's the axis of rotation right?

Homework Statement A cat walks along a uniform plank that is 4.00m long and has a mass of 7.00kg. The plank is supported buy two sawhorses, one .440m from the left end of the board and the other 1.50m from its right end. When the cat reaches the right ened, the plank just begins to tip. What...

http://www.csun.edu/~phys100a/solutions_cadavid/hw4-ch5.pdf I found the problem here #28. I just don't understand why you would use sin and not cos. My professor said that whichever the angle is being made with, you would use cos with that axis.

Yeah, I don't quite understand why you would do it that way. I was thinking of Fcos45 = 130cos214 since it's on the x-axis.