Recent content by finlejb

A 1.95 kg ball is attached to the bottom end of a length of 11.0 lb (48.9 N) fishing line. The top end of the fishing line is held stationary. The ball is released from rest while the line is taut and horizontal At what angle (measured from the vertical) will the fish line break? I've...

What do you mean a more general equation for drag? That's all my book gives me...

But the equation for the force of friction is f_f = \mu N. I don't know the coefficent of friction... unless it's 1 since it's flying through the air?

A fire helicopter carries a 560-kg bucket at the end of a cable 20.6 m long as in the figure below. As the helicopter flies to a fire at a constant speed of 39.2 m/s ,the cable makes an angle of 39.6 with respect to the vertical. The bucket presents a cross-sectional area of 3.96m^2 in a plane...

Now it says to determine its average acceleration during the 36.8-s interval. The j part of it was the same, but it's telling me the i part of the average acceleration isn't the same, and I can't understand that.

Oh it does say the speed is uniform, so I guess I can find the average speed and that would be the speed at B... I'll try that and see if it's right.

I was given time from A to C. This is just measuring from A to B. It's not just half the time given, though, since it's not a 50 degree angle.

Right, but I don't have mass or velocity...

Oh yeah, it's a three part problem... apparently I forgot to put which part I need help with. First of all, what is the acceleration when the car is at B located at an angle of 36.8? Express your answer in terms of the unit vectors i and j. But ok, I can see how I don't need tangential...

A car initially traveling eastward turns north by traveling in a circular path at uniform speed as in the figure below. The length of the arc ABC is 237 m, and the car completes the turn in 36.8 s. What I've got so far is that I should find the tangential acceleration at B, and then I can use...

I don't quite understand that. I think my problem, though, is in the actual math part, not the concepts... I've got that F=mass*centripetal acceleration, and you rearranged that to get m/r = F/v^2, but I don't really understand that last step. And how do you type the formulas in the...

I have this problem as a part of my online phyics homework... it's the first question and I can't figure it out so it doesn't bode well for the rest of the assignment, so I might have to be back a lot before it's due Friday. Any hints on how I should go about solving it? A curve in a road...

That equation doesn't really help me though, Jameson. It has two variables in it that I don't know the value of. And I kind of see where you're going, Doc Al, but why h/3? It seems like 2h/3 would be what I'd want to solve for...

An object is thrown vertically upward such that it has a speed of 21 m/s when it reaches two thirds of its maximum height above the launch point. Determine this maximum height. I can't figure what to do since initial velocity isn't given and I don't see a way to solve for it.