# Search results

1. ### Projectile Motion, package has to land on a moving ship after being droped from plane

lol now I look like the crazy one
2. ### Projectile Motion, package has to land on a moving ship after being droped from plane

That's it, I'm putting down what I originally had as my answer: "Plane's do not drop packages. If this plane dropped the package, then the package would be destroyed." But, we could assume the package is dropped from an altitude of 900m?
3. ### Projectile Motion, package has to land on a moving ship after being droped from plane

That's what I had thought as well, that the height of the plane was fixed. If i go with this approach, then the plane doesn't have two velocity components? Only one because the height is unchanging. Which would mean the package's velocity in the y component is due to gravity; it would be in...
4. ### Projectile Motion, package has to land on a moving ship after being droped from plane

i think so, but originally i had thought the plane is constantly at an altitude of 900m
5. ### Projectile Motion, package has to land on a moving ship after being droped from plane

I see what you are saying, in the initial velocity it gt is not involved, but AFTER it is dropped, yes. I think I have worked out a solution. Bare with me. 1. Vpack (y component) = Vplane*sinθ + gt 2. ((Vpack y)^2 - (Vpack nought y)^2)/(2g) = dy (altitude from which the package has to...
6. ### Projectile Motion, package has to land on a moving ship after being droped from plane

@lewando, the x axis would be the distance's between the nose of the plane and the rear of the ship. The y axis would be the difference in altitudes. Okay, I drew a diagram the velocity of the plane is given but it has an x and v component. Vplane = 180 m/s Thus the intial velocity...
7. ### Projectile Motion, package has to land on a moving ship after being droped from plane

Homework Statement A plane flies at 900m and has to deliver a package. It flies at 180 m/s North at 15° below the horizontal. The ships velocity is 40 m/s and it is travelling due north. At what horizontal distance from the ship must the package be dropped for it to land on the ship...
8. ### Deriving the Equation for Period of Simple Pendulum? Is my attempt correct?

I have not come across any of the terminology you have just said. I doubt I would be allowed to use that method. Could you describe it in another way or comment on my attempt?
9. ### Deriving the Equation for Period of Simple Pendulum? Is my attempt correct?

Homework Statement I have to derive an equation with the following variables: T= period m= mass Theta= angle l= length and I was told to think of the period as the perimeter of a circle. Homework Equations The Attempt at a Solution C=2\pi r,C/2=\pi r,d=\pi r,(at^2)/2=\pi...
10. ### Pulley but the cable is at an angle?

In the diagram above, m1 = 285g, m2 = 755g, theta = 10.0 degrees, and mu = .047. If system is released from rest, how long does it take m2 to reach the end of table. Assum m1 can fall atleast 2.50 m.
11. ### Pulley but the cable is at an angle?

I wish my PhD prof would realize this
12. ### Pulley but the cable is at an angle?

http://img7.imageshack.us/img7/3597/doc092911.png [Broken] Alright, that is how I'm setting up the problem.
13. ### Pulley but the cable is at an angle?

The tension (resultant and tension for the hanging box) was calculated using the weight of the hanging box. Also, I'm in a Trig based physics course and we CAN'T do derivatives, actually we're not supposed to.
14. ### Pulley but the cable is at an angle?

I meant to say that the tension of the falling box is equal to the resultant tension of the sliding box. The tension in the x direction would be cos (10) * Tension of falling box.
15. ### Pulley but the cable is at an angle?

Homework Statement http://img813.imageshack.us/img813/594/75309500.png [Broken] http://img813.imageshack.us/img813/7166/51848816.png [Broken] I have to find acceleration to calculate how long it takes the heavier box to reach the end of the table. Homework Equations The...
16. ### Rocket fires its engine, force/acceleration

I haven't learned momentum yet, can't solve the problem using that method. Also, what direction is the rocket travelling in? Fey or Fe?
17. ### Rocket fires its engine, force/acceleration

Homework Statement A small space probe of mass 235 kg is traveling at 85.0 m/s. It fires its main engine at an angle of 63.00 to its original direction of travel. The engine produces a thrust of 12,000 N and there is enough fuel on board for a 10.0 s burn. What distance will it have traveled...
18. ### Acceleration from Position vs Time^2 ?

Homework Statement http://img824.imageshack.us/img824/6466/31231242.png [Broken] http://img835.imageshack.us/img835/5220/76022234.png [Broken] It's a free fall problem and I have to calculate a = g Homework Equations g = (2*(d-(vi * t)))/t^2 g = (2d)/t^2 The Attempt at a...
19. ### Math tricks for everyone

came in here expecting 1+1 = 11 saw posts everything went better than expect :D
20. ### Quick Question (Epsilon/Delta Limit Proofs)

Homework Statement [PLAIN]http://img641.imageshack.us/img641/2494/mathg.png [Broken] I've worked through it and at the 1st step I get: (1/-e+1)<x<(1/e+1) How do they have (1/e+1)<x<(1/-e+1)? Do you switch the signs of an inequality when you take the inverse of both sides?
21. ### Hyperbolic Sound Travel?

Im guessing that c = the distance between A and B. a = the difference in time that the sound reaches the points b = what I need to find? I'm still unsure at how I'm reaching this conclusion, my book just says this is true and doesn't explain why.
22. ### Hyperbolic Sound Travel?

i know the hyperbola equation and that c^2 = a^2 + b^2
23. ### Hyperbolic Sound Travel?

Homework Statement Two recording devices are set 2400 feet apart, with the device at Point A to the west of the device at point B. At a point on a line between the devices, 400 feet from point B, a small amount of explosive is detonated. The recording devices record the time the sound...
24. ### Rotation of Axis and Hyperbolic Sound Travelling Word problem?

Homework Statement 6x^2-6xy+14y^2-45=0 Two recording devices are set 2400 feet apart, with the device at Point A to the west of the device at point B. At a point on a line between the devices, 400 feet from point B, a small amount of explosive is detonated. The recording devices record...
25. ### Hardest Identity Evar involving sum and differences

Homework Statement sin (x) + sin (3x) + sin (5x) + sin (7x) = 4cos(x)cos(2x)sin(4x) Homework Equations sin(a+b)=sin(a)cos(b)+sin(b)cos(a) sin(a-b)=sin(a)cos(b)-sin(b)cos(a) The Attempt at a Solution Me and four of my classmates have tried to do this proof and it kicked our ***...
26. ### Graphing with a ti 84

Homework Statement If I graph an equation with my ti 84, is there anyway I can take the x values in the 2nd [table] spreadsheet of of x and y values and make the x values fractions? They're all decimals and I wan't them in fractions if possible. Can it be done? Homework Equations...
27. ### How does one Study ?

The rest of the class IS STRUGGLING, there were 2 high grades (92) and everyone else had below a 75. The mode was a 50%. The professor is incredibly hard, reads powerpoints made by the book's author. I asked her once to explain how the product to sum and sum to product identities were derived...
28. ### How does one Study ?

100+ views and no one knows how to study?
29. ### Impossible Bearing and Triangle word problem.

Yea I knew that, that's obvious. But what do I do after? I can't use a 90* angle to solve trig functions can I?