Recent content by chudzoik

Oh wow forgot entirely about that. These kinds of mistakes will be the end of me. :redface: Thanks for the help.

It says the answer should be f'(x) = -2sin2x.

Homework Statement f(x) = cos2x - sin2xThe Attempt at a Solution f'(x) = (2cosx)(-sinx) - (2sinx)(cosx) f'(x) = -2cosxsinx - 2sinxcosx This is what I think the answer should be, but the back of the book says otherwise. I need help identifying what I did wrong.

Where does c come from and what does "certain c" mean exactly?

Homework Statement Given that 2 is a repeated root of the equation 2x^3 + px^2 + qx -4 = 0, find the third root and the values of p and q. Homework Equations b^2 - 4ac(?) The Attempt at a Solution Since it said 2 is a root I plugged in 2 as the value of x and rearranged the...

Homework Statement Two hockey pucks of equal mass undergo a collision on a hockey rink. One puck is initially at rest, while the other is moving with a speed of 5.4 m/s. After the collision, the velocities of the picks make angles of 33° and 46° relative to the original velocity of the moving...

So they are both 0 then? I think that clears up a lot of my confusion with this problem.

But I don't think I have enough known variables to do that. If I use vfx = vix + ax * t then I don't have ax and I don't have the initial velocity in the y direction either so I can't figure out the final velocity in the y direction.

Homework Statement A watercraft with an initial velocity of 6.4 m/s [E] undergoes an average acceleration of 2.0 m/s2 [S] for 2.5 s. What is the final velocity of the watercraft?Homework Equations vf = vi + a * t a = v / t v = v2 + (-v1) pythagoras and cosine law? The Attempt at a Solution I...

Is that the formula with 1/2 mv2 and mgh in it? I looked it up and it came up with stuff like Δ(U+K) = 0 and U + K = E which don't look familiar to me at all. I'm in Grade 12 right now, so should I have learned it?

Well I know conservation of momentum, but I don't know how it would apply to my question.

I honestly have no idea what your hint means :-p Can you explain further about what formula I'm supposed to use?

I am trying to calculate the speed of an object at the point that it flys off the half circle ramp, and I was wondering if it would be correct to use the formula v2=v20+2aΔx to calculate the final velocity of the object as it exits the half circle thing.

Homework Statement Blue light (λ = 482 nm) is directed through parallel slits separated by 0.15 mm. A fringe pattern appears on a ascreen 2.00 m away. How far from the central axis on either side are the second order dark bands? λ = 4.82 x 10-7 m d = 1.5 x10-4 m L = 2.00 m m = 2 y= ...