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...
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...
Homework Statement
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I have to find acceleration to calculate how long it takes the heavier box to reach the end of the table.
Homework Equations
The...
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...
Homework Statement
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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...
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?
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...
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...
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 ***...
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...
High school stats:
1860 Sat
87-88 GPA
Top 33%
No extra currics.
I got into a nice state school but couldn't afford it (I got 20K but still came short by 10-15K). Now I am at a Community College. I am taking Bio 102/Pre Calc/Engl 101/Speech 101. I want to finish my 2 year Associates in...
How does one "Study"?
I'm currently taking:
Math 119 (Pre Calc)
Engl 101
Spch 101
Bio 102
The Math 119 class is killing me. It's really making me frustrated because I had not expected CC classes to be, you know, hard.
For math, I do all the hardest problems in my book, I have access to...
Homework Statement
Radio direction finders are set up at points A and B, 8.68 mi apart on an east-west line. From A it is found that the bearing of a signal from a transmitter is N54.3*E, while from B it is N35.7*W. Find the distance from B, to the nearest hundredth of a mile.
A person...
Homework Statement
When you have something like
and you wanna use the pythagorean's theorem identity but lets say i do it with the 3rd term in the parenthesis, then would this be valid
and what about this is this also valid?
Homework Equations
N/A
The Attempt at a...
Need some guidance as I'm the first of my ancestors to go to college :)
Well my parents came into the USA in hope of a better future and for a better education, but they could not afford it. Both of my parents are high school dropouts from a 3rd world country, so asking them for guidance is...
Homework Statement
\frac{secx-cscx}{secx+cscx}=\frac{tanx-1}{tanx+1}
\frac{(tan^{2}x - cot^{2}x)}{(tanx + cotx)}= (tanx - cotx)
tan^{2}2x+sin^{2}2x+cos^{2}2x=sec^{2}2x
cot^{2}2x+cos^{2}2x+sin^{2}2x=csc^{2}2x
The Attempt at a Solution
I've tried many times in my notebook and i'm...
Homework Statement
http://img135.imageshack.us/img135/4150/trighelp.jpg [Broken]
Homework Equations
The Attempt at a Solution
http://img18.imageshack.us/img18/8480/workz.jpg [Broken]
Please help I'm totally confused, if anyone can help I can offer a reward of monetary value :).
Homework Statement
http://img135.imageshack.us/img135/4150/trighelp.jpg [Broken]
Homework Equations
The Attempt at a Solution
http://img18.imageshack.us/img18/8480/workz.jpg [Broken]
Please help I'm totally confused, if anyone can help I can offer a reward of monetary value :).
Homework Statement
A pedestrian is jogging on a path and sees a boat coming towards him. He's moving at 10 km/hr and the boat is moving at 20km/hr, how quickly does the jogger approach the boat?
Homework Equations
I'm guessing these:
Vf = vi + a * t
D = vi*t +1/2 a * t^2
Vf^2 =...
Homework Statement
How do i figure out the TOTAL displacement of this graph
http://img186.imageshack.us/img186/7677/36947032we7.jpg [Broken]
Homework Equations
I'm guessing A=1/2bh
and A = bh
The Attempt at a Solution
I've got no idea due to the line crossing the X axis
Homework Statement
If you exert 28N of horizontal force while pushing a 10.2 kg box across the surface of a floor at constant velocity, then what is the kinetic friction coefficient between floor and the box?
Homework Equations
EF = ma
Ffk = uK * Fn
The Attempt at a Solution...
Please help with Kinematics HAVE MID TERM TOMRROW :(!!
I have a mid term tomorrow and I'm in a dire situation. I don't remember how to do kinematics equations like
A bus leaves the terminal and travels for 900s at an average velocity of 10 m/s before it stops at its first destination. How...
Homework Statement
Marianne borrowed 10000. She borrows from a friend at 8%, twice that amount from her bank at 9% and the rest from her Insurance at 5%. She pays a total of 830 in interest for the first year. How much did she borrow from EACH SOURCE?!!
Homework Equations
??
The...
Homework Statement
A ship leaving its port sails due north for 30 miles and then 50 miles in a direction of 60 degrees east of north. At the end of this displacement, where is the ship relative to its port?
An army recruit on a training excercise is instructed to walk on a bearing of 6.3...
Homework Statement
A car initially traveling at 15 m/s accelerates at a constant rate of 4.5 m/s^2 over a distance of 45 m. How long does it take the car to cover this distance?
Vi: 15 m/s
Vf: ___ m/s
A: 4.5 m/s^2
Delta D: 45 M
Delta T: ___ s
Homework Equations
I'm guessing I would have to...
Homework Statement
I have H2SO4 + BaCl2 → and need to figure out what it will create.
Homework Equations
Now I don't know how to figure out ionic charges or the rules of writing ions/chemical equations. I mean tried to break that up in class today into separate ions and my teacher said...
I know its a rather simple question but if you think about it, it requires much knowledge of d orbital. Is there an easy way a HS student can determine charges of elements using only a periodic table and no prior knowledge of orbitals? My old chem teacher said you could take the element and...
This is my reaction
Pb(NO3)2(aq) + H2SO4(aq) → PbSO4(s) + HNO3(aq)
Pb + (NO3)2(aq) + H2 + SO4(aq) → PbSO4(s) + H + NO3(aq)
So far I've done that, and now I'm stuck I see h2 and h and NO3 2 molecules and on the left side i see only one NO3 molecule on the right, can I cross out both or do i...
Homework Statement
Pb(NO3)2(aq) + H2SO4(aq) → PbSO3(s) + HNO3(aq)
Pb + (NO3)2(aq) + H2 + SO4(aq) → PbSO3(s) + H + NO3(aq)
The Attempt at a Solution
So far I've done that, and now I'm stuck I see h2 and h can I cross out both or do i have to balance right now? My teacher said you can...